Absolutely what I would recommend. He just needs to buy one of those memory card to USB adaptors, put the free MC boot files on and then he will have the ability to play games from the HDD. I have a Slim PS2 because my Fat broke all those years ago. Rather regretably my parents threw it away, could've resurrected that beast! On the bright side my Slim PS3 can play most PS2 games I throw at it and fat PS2s are pretty inexpensive these days. And eventually I hope to get a strong enough PC that can run PCSX2.
Afaik this only works with the official Sony MC adapter they released for the PS3. Generic brand ones will not work (please correct me if this has changed)