lifting weights does very little in actual fingers strength. there are funny videos around when muscular lifters try climbing, they fail quite fast after couple of moves.
you can train a bit with various squeezy thingies, what helps too is just hanging by hands from some thicker bar (so you cannot grip it comfortably). but by far best training, especially in beginning is just climbing. it takes time for all connecting tissue to build up (tendons, ligament etc. - it's not about muscle for fingers). fingerboard can indeed be dangerous if attempted early - say from 6b-6c in french scale.
much of the art of staying on the wall is about proper balance - this can be trained a bit on slackline for example, but again best training is just climbing often.
Honestly: it seemed a bit off to me too, but it was mentioned so I assumed it probably did something.
Although, the lifter thing is more just that they don't realize they need to use their legs. Common problem in general, but most people are weak enough that they realize "Something isn't right here" soon enough.
We like to mock one of our friends because he started off climbing and was completely drained after a single 5.7 because he used JUST his arms. Made it to the top (and got pretty damned far up a 5.8), but... holy crap. Few things will make you feel more inadequate than being reminded that your belayer used to do that.
you can train a bit with various squeezy thingies, what helps too is just hanging by hands from some thicker bar (so you cannot grip it comfortably). but by far best training, especially in beginning is just climbing. it takes time for all connecting tissue to build up (tendons, ligament etc. - it's not about muscle for fingers). fingerboard can indeed be dangerous if attempted early - say from 6b-6c in french scale.
much of the art of staying on the wall is about proper balance - this can be trained a bit on slackline for example, but again best training is just climbing often.