@aloped
I too, have been searching for certain posts by Leonid Surpin, and temporarily gave-up the search, but your post reminded me to try again. Previously I only searched for subjects and felt lucky to find Leonid’s posts.
But this time, I searched on his name, and at the bottom of the listing where it says “show more”, I see his avatar, a purple circle with L inside.
I clicked on his avatar and it took me to his activity page, where I could see all of his posts.
Or you could just click this:
@leonid_Surpin
Then click on his avatar.