Hence I put it in brackets,Yes, but he doesn't actually state the 'in his opinion' bit.
It seems he also wrote this somewhere
You are right to be paranoid. Two tings wrong, no point in a FCU on the lighting circuit. A 3 amp fuse has no discrimination against a 6 amp MCB. More important a 13 amp socket on the lighting circuit is bad practice. You may not plug in a heavy load, someone else might, trip the lights and put a foot through the ceiling or worse. You are in a new build. Don’t let your first job be a bodge. Bring a feed up from the ring behind a bedroom cupboard.
In my opinion to have a cable from a ring main ( 32 Amp ) run up the wall in the back of a cupboard is not acceptable unless that cable is properly installed in a chase in the newly plastered wall with accessories to create a safe zone for the new cable.