There's a reason he compared Reddit with Twitter and Facebook. You interact a lot with social media (commenting, liking, etc.) and also their content is much more dynamic and personalised.

Wikipedia is very static in comparison.

I'm not sure how you can say Wikipedia is static, even by comparison: https://en.wikipedia.org/wiki/Wikipedia:Statistics

From your link: Wikipedia develops at a rate of over 1.8 edits per second

The statistics I can find for Reddit put it at 160 submissions per second[0]. And that's not counting comments or votes. And each vote changes the ordering of submissions and comments.

[0]https://www.reddit.com/r/dataisbeautiful/comments/8aek7d/red...

>that's not counting comments or votes

Or 'hide', in every sub I'm active in I hide each new thread after I've decided I am not interested or after I've looked at it so I can quickly scan new stuff.

Then add automoderator removing things for manual approval, approval of threads etc. Gilding, messages, chat etc.

and Wikipedia also runs on a shoestring - even with some of the smartest people I know working at Wikimedia, the tech department could have 10x the people without running short of work at any point