They did the lump check for free as well, which I think is a sign of an awesome Vet. I have been briefed to keep an eye on them and make sure they don't change. She also said that if he suddenly sprouts more lumps then bring him back as well.
He now weighs 30 kilograms, and the Vet said that was a good weight for him because he still has a waist. She wasn't concerned about him not eating as much as he used to as now that he is getting older he is moderating his weight himself.
All in all, good news!