No. RTP is a standalone file package used by many RPGM games.
You just have to have RTP in a separate folder on your PC, and all RPGM games that require RTP will function properly. Which also saves tons of disk space, because you only need to download those files once, which then are used by many games without any limits.
But if you try to shove it into a game's files, you'll have to repackage and redownload RTP for each and every game again and again. Not to mention that it will not work in the first place, because games look for RTP folder, not RTP files.
This is simply not true. There's hundreds of RPGM games that require RTP installed, especially the older RPGM games. Different RPGM engines and different engine specific RTP versions.