I think that is slightly misleading, all the client diversity efforts is focused on Ethereum 2.0 now, as the old clients will be dead soon. [1]
This is the most updated stat I've found: https://twitter.com/sproulM_/status/1481109509544513539 (read the rest of the twitter thread too!)
Still not great though, but better at least.
[1] https://clientdiversity.org/