This is probably not the one you're referring to, but Pat Brown, co-founder of Impossible, also has quite a strong opinion on cultured meat. If somebody figures out how to grow animal parts artifically and reliably, there are much more interesting applications than to eat it. Such as medicinal applications.

I think the main point here is not that we will never figure it out, but that it will take a long time. Time, that we don't have with the imminent climate and biodiversity crises.

It makes much more sense to create meat directly from plant proteins than to try to grow it artifically. Brands like Impossible make damn great burger patties, chicken nuggets, and what not. I'm pretty most people wouldn't be able to tell the difference to animal meat in a blind test.

Thermodynamically it doesn't even seem like cultured meat should be any better than traditional meat. Sure you are making more stuff than just meat, but like nearly 100% of the animal ends up being used in some capacity for different sources that now all need a synthetic alternative developed that happens to be better for the environment than the old way of using a cow. Call me incredulous but I feel like it would be better to just figure out how to lower the environmental costs of having the cow. You have this sytem that already works fine to generate meat and a host of other products from known inputs. Why reinvent the wheel? Just make a better wheel. Capture the methane. Farm feedcrops in sustainable ways. Treat the animal with respect over its life.