Darwin’s Dilemma or rapid Earth growth spurt?

darwins dilema exapnding growing earth expandedIs the article and theory quoted below geology evidence or at least a geology theory backing the idea that our planet has had sudden and rapid tectonic movement?

It is hard to understand rapid massive movements of plates when geology theory suggests events happen very slowly.

Depending on how you interpret the evidence could this show that a Growing Earth could have massive and sudden growth spurts?

Around 530 million years ago, a wide variety of animals burst onto the evolutionary scene in an event known as the Cambrian explosion. In perhaps as few as 10 million years, marine animals evolved most of the basic body forms that we observe in modern groups. Among the organisms preserved in fossils from this time are relatives of crustaceans and starfish, sponges, mollusks, worms, chordates, and algae
The Cambrian Explosion | University of California, Berkeley

What would trigger massive and quick expansion of the height of the crust be it the continental and/or seafloor?

A paper ... suggests a major tectonic event may have triggered the rise in sea level and other environmental changes that accompanied the apparent burst of life.

The Cambrian explosion is one of the most significant events in Earth’s 4.5-billion-year history. The surge of evolution led to the sudden appearance of almost all modern animal groups. Fossils from the Cambrian explosion document the rapid evolution of life on Earth, but its cause has been a mystery.

The sudden burst of new life is also called “Darwin’s dilemma” because it appears to contradict Charles Darwin’s hypothesis of gradual evolution by natural selection.

“At the boundary between the Precambrian and Cambrian periods, something big happened tectonically that triggered the spreading of shallow ocean water across the continents, which is clearly tied in time and space to the sudden explosion of multicellular, hard-shelled life on the planet,” said Dalziel, a research professor at the Institute for Geophysics and a professor in the Department of Geological Sciences.

... Although the new analysis adds to evidence suggesting a massive tectonic shift caused the seas to rise more than half a billion years ago
Massive geographic change may have triggered explosion of animal life

Sam Carey (Samuel Warren Carey) and James Maxlow are geologists who study/studied plate tectonics (continental drift). Their research and what it implied led them to suggest that the planet is expanding, that we have expansion tectonics and not plate theory.

Most major animal groups appear for the first time in the fossil record some 545 million years ago on the geological time scale in a relatively short period of time known as the Cambrian explosion. Of great worry to Darwin, the explanation of this sudden, apparent explosion persists as a source of numerous major debates in paleobiology.

... The theory of the Cambrian Explosion holds that, beginning some 545 million years ago, an explosion of diversity led to the appearance over a relatively short period of 5 million to 10 million years of a huge number of complex, multi-celled organisms. Moreover, this burst of animal forms led to most of the major animal groups we know today, that is, every extant Phylum. It is also postulated that many forms that would rightfully deserve the rank of Phylum appeared in the Cambrian only to rapidly disappear.
The Cambrian Explosion | Fossil Museum

Geologically quick movements of the planets crust, mantle or internal areas may be more acceptable an idea in a Growing Earth scenario?