Looks like this is a special case. The thread will show replies on both sides if you go look at the Modern version, then click on "Classic View". The problem is that Classic doesn't keep threads that long and it's long archived (not on the forum list). The replies do end up there, but they end up being single posts and threads.
I should stop modern view replies anytime the thread rolls off classic, but it's not an easy thing to do. So replies just keep rolling in over the years from the Modern side. They aren't viewable on the classic side.
Given how old it is, the view count is easily possible. If you imagine how many millions of people may have typed in that search string in a search engine and then clicked in, it's believable. If we kept view counts on classic, it would be probably 5 times that.