Maybe, but remember there is alot of reflectivity variation of the different types of original discs. Scratches, snot, dust and different crap on the surface all play a part on how well it can be read. So if they use the reflectivity values to try to stop DVDRs, then they can effectivley be stopping original media from being read!
It's much easier to to a boot sector check than it is to base a boot upon reflectivity.
Also, a chip then can hack the BIOS to feed false values and get the machine to boot the media, no matter what is in the tray.
The Yellow PS2 auto-boots all. PS2, PS1 stealth and DVD movies.