Why suspicious? you can't obligate him to say.
I've seen hundreds of threads with wannabe-games, but what about it? if he's learning then it's no problem. Does it affect you all? Don't think so. Does it affects ID Software? Don't think so - it's not even a finished fan game for God's sake! I used to use graphics of other games in my MS-DOS game programming days, and some models grabbed free from Turbosquid, 3D Cafe and other places sometimes, so what's the big deal?
I just saw the video... looks fairly decent... to be honest, since I got my new video card I've been wanting to use the new stuff in DBPro - that including shaders & water effects - so grabbing a .fx file for use in DBPro and make my water all shiney and wavey won't be a problem, right? at least I don't think so...
If it's a RIP, then report him or let him be, he's learning at least (I hope, you gotta be real DUMB for not learning anything even when ripping something... I learned a LOT way back when making a Rebel Assault-type game, just for the heck of it, and I'm still using the same stuff I learned back then, so...), and if he doesn't appears, and/or creates another thread about it, then let him be on the hands of the mods...
Quote: "Compaq Deskpro EN / Intel Pentium III 930Mhz / 256Mb RAM / Intel i82815E 64Mb AGP / SoundMAX Soundcard / Creative SBS 2.1 / Two 40Gb HDs / WinXP Pro & Debian Etch / 1280x1024x16b"