This is me catching up.
This problem was solved recently with De-Clicker.
https://forum.audacityteam.org/t/updated-de-clicker-and-new-de-esser-for-speech/34283/1
That was applied to fix a problem in this posting. The improvement is audible, but the problem is not immediately obvious.
https://forum.audacityteam.org/t/sample-wav-file-evaluation-requested/42970/1
Koz