Sorry, but I would call a good equine vet with an xray machine NOW and find a GOOD farrier experienced in *successfully* rehabbing founder. I would be feeding the horse only on soaked hay(to leach out sugars), keeping him on soft, clean footing, probably bandaging & booting that left one for now, at least until otherwise advised by a vet.
It seems pretty obvious to me your horse has NOT recovered from founder/laminitis & likely has some pretty major 'rotation', especially the left fore. The hole looks like it may be solar penetration of P3, but it is hard to tell anything from grotty feet - you need to post pics without them being mud-filled. Some different angles of the sole would be good too, to get an idea of heel height, depth, etc.
I'm generally loath to judge from just a few av pics, but if your farrier's impressed by the state of them, either it's in comparison to how terrible they were before or the farrier doesn't know much about feet. Especially given the likely possibility that the sole is not just thin but actually penetrated on that foot, I consider it a VERY wrong trim that the farrier has pared/rasped sole material. He also hasn't done anything about the excessive toe length/flare. Can't tell whether he's made any start on improving angles by lowering heels.
The horizontal rings/ridges on his feet show that he's been suffering regular bouts of laminitis for at least the last year, at least until recently - looks like the 'attack' of about a month ago may have caused a couple of abscesses at the toes? Look up Equine Cushing's and Insulin Resistance Information
to learn more about why this may be happening & what to do about it. Equine Lameness Prevention Organization
is one good source of info regarding understanding hoof balance. Pete Ramey hoof care laminitis founder horse navicular disease thrush equine foot development farrier
is one great site on hoof care generally & for learning what's involved in rehabbing horses with these type problems. Not every horse is able to be rehabbed, but there is a good chance that if there's not too much bone loss, that with careful care & management, he can get better. Lots of learning to do if you want to give him the best go.
Drawn on some of your pics help you see. Red lines indicate approximate location/angle of P3. Green lines show approx where the walls *should* be growing & blue lines show approx how I'd trim to facilitate this.