More like a much wiser Uncle telling his inexperienced nephews why they are making a bad decision.
"And that startups somehow occurred in periods with much less economic inequality."
Startups did occur in periods with much less economic equality, but there were also much less government regulations.
PG is saying that the current solutions for economic equality, which is always an increase in taxes and regulations, will mean the death of startups. He's right. It's a warning for the future generations of startups.
Anyone with wealth won't really be effected, because other countries will accept them (and their tax dollars) with open arms.
Look at any of the Nordic countries: They all tout income equality, but your only options for work are the government or a big corporation.
Startups are nearly impossible to get past the initial stages because regulations and taxes kick in and your lifeblood is cut off before you even get a chance to get anything going. Investors also steer clear of the entire region. This is a great indicator that it is not conducive for any sort of small business.
This bottleneck prevents prosperity and creates an environment where citizens are more dependent on big corporations and there is almost no chance of moving up the socioeconomic ladder.
It also means less of a chance of getting a loan from a bank, which is another requirement for someone with no money to start a business.
I've never met a group that tries so hard to sabotage their own future success/vote against their own self-interests.