The 32nd degree is achievable by all adult males who become Masons.
Sorry, but I stopped right there.
Disclaimer: I am a 32nd degree mason in both the Scottish and York Rites.
There is no contradiction between what you are saying and what is printed above.
Howard simply says that the 32nd degree is a "select group". IOW, that while in theory it is achievable by all, not all attain this rank.
Am I wrong?