Hybrid SACD, no? The 1954 Lucerne concert is at least hybrid SACD.
Personally, I'm not sure that SACD or DVD-A would make all that much difference in this case. Jonathan's remastering — for all three reissues, so far — sounds better to me than some of the (hybrid) SACDs I own. I don't own an SACD player, by the way (adding import to Hans's observation). I would own one ... if I didn't spend my money on reissues!
These International Phonograph reissues sound as good to me as Audio Wave's XRCD reissues (another niche market program).
I do own a SACD player, two actually, and I must say that these reissues would sound even more fantastic on SACD. I don't think the economics would allow SACD issues from JLH, but they would be welcome at my house and I know they would sound even more fantastic than the Redbook cds do. Mastering of this quality on SACD sounds amazing.