Yes, you will get many results. But I think that the search function still doesn't work as it should when you search for a term in the posts of a specific member.
I can confirm this as well. I'm certain I have mentioned "Bitcoin" more than 12 times and at least once since 2021, but that's the total number I'm getting and the most recent date.
Considering the admin is already aware, we can give it a couple of hours or days to be fixed and use the alternative search options in the meantime.