Not all babies want to subscribe to baby led weaning.
It's nothing to do with BLW. Standard weaning (which I also did, I did not do BLW) is pretty clear that they should be eating a mostly normal diet with chunks of food by 12mo.
Baby food jars not unhealthy in any way, but they have a "jarred food" taste and texture (they are milled to be ultrasmooth, far smoother than you can do at home, and are heated in a particular way to make them last, which gives them a slightly caramelized flavor. They are also often very sweet, due to having a lot of apple and other very sweet ingredients).
The problem is that if a baby is hooked on these and won't eat normal food, it is not really preparing them for eating family meals and can encourage very fussy tendencies. The fact that the OP's baby not only wants only jarred food but also insists on extra fruit puree mixed in suggest that they may have got into a "thing" of expecting everything to taste sweet.
If a baby ate nothing else at 12mo, I would be tempted to go cold turkey and put some pressure on to eat other things, and if that did not work, I would consider consulting a specialist, as severe issues with lumps and textures sometimes indicates sensory or swallowing issues.