Same with a lot of physical infrastructure. The UK has a robust railroad network today, but it was built during a bubble that was so insane people would take loans from banks to invest in railroad stocks.
How does it matter to you? If you had invested in Internet broadly, you would have been WAY better off in the long term. Meaning: your strategy had been to keep investments tied to Internet first companies, you would have done better than pretty much any other person.
Things go up and down but broadly internet went up.
So evidence that internet was a bubble is wrong, it in fact shows that pensions did the right thing by putting money in the internet.
Now, if you had put your money in those stocks 12 months later, you would do okay (except for Sun). So, no, those pensions did not do the right thing by buying at the peak of a bubble. At least, not for people like me who don't like 15 years of negative returns.
[1] https://companiesmarketcap.com/sun-microsystems/stock-price-...
[2] https://companiesmarketcap.com/cisco/stock-price-history/
Why not NASDAQ?