It seems like he's saying the metal abutments need to be replaced so maybe theres an issue with them. It seems plausible.
Bro the abutments will be seen sticking out if the crowns pop off.
I know because I had to get implants after a bad car wreck.
Had to go to the dentist a few months back because the crowns pop off after I was eating some damn Starburst jellybeans.
Them nubs was sticking out, my people made fun of me.
When dentist cemented them back in he told me he could use a more permanent cement but would have to destroy the crowns if I ever had problems.
Plus them abutment screw into the anchors so there easy to replace. To take them anchors out serious work, but they really should last for life in the jawbone.
Also if the abutments come off you have to get them put in asap or the gums will start to heal and cover the opening