They are giving you false info, if you haven't already got the games.
>GOW 2 has been split into two dvd-5s that works just fine using ESR.
I haven't seen GoW 1 being split into two.
>My DVD5s have all cutscenes and game content without any downsampling.
GoW1 has trailers and bonus material you can remove without touching anything in the game including video scenes. GoW2 has a lot of duplicate files that can be linked to each other.
I've completed both that work just fine, although there's a lot of bad copies out there and bad disks can cause trouble with the laser.
>You can play them in DVD9 if you use the toxic patch.