There's no strong consensus, but there's weak consensus that post-GFC regulation is a factor behind but is not causal in any way, for the decrease in IPOs. Here's a paper [1] (well it's the paper author discussing his paywalled paper lol) exploring SOX regulations and their effects on IPOs. There's other papers and I think a good survey will help you on this topic. I don't think there's consensus on regulations being the causal factor, but it is one of many.

I thought GP was modest in calling it out as simply a contributing factor. Regulation is complicated and reaching for it should be something done with care.

(Also FWIW, I think you're being a bit cheap by appealing to culture war talking points.)

[1]: https://corpgov.law.harvard.edu/2009/09/21/the-effect-of-sox...