It is addresses that hadn't done anything for the last two years. That is not exchanges. That is whales seing off. It states there is 40% more BTC in circulation since they started selling.
Maybe actually take a look at the link that was showed to you? Most of the top addresses has sent a transaction since 2018. Cut the crap. Seriously. "This is not exchanges", well crap. The name of the exchanges are even stated in that link.