I’m not t-bonham, but how does that contradict what he said? The reference you provided confirms that he was indeed a member of the Hitler Youth.
The additional context you mention is useful, membership was a formal legal requirement, and the evidence that he joined should be considered in that context. I would add, however, that the wikipedia article on Hitler Youth mentions that in spite of that requirement, 10-20% of young German males at the time avoided joining in spite of the possible legal consequences. The fact that he wasn’t among them should also be considered as part of the context.
The unsupported claim by his own brother that his membership was unenthusiastic is not worth much as evidence.
And that “except” is again not dogma but a rule - it’s not a matter of faith.
t-bonham didn’t merely state that Benny belonged to the Hitler Youth at one point, but stated it in a way that called Benny a Nazi without actually having the cojones to use the word.
Useless as far as the US is concerned, possibly. But 95% of the world’s Catholics are in countries other than the US, and the attention of the present pope is firmly on Catholics in the global south - about 60% of all Catholics, and rising fast - the question of how a Council would play out in the US is probably not the main consideration.
The “should be a Catholic” rule is not inflexible. In particular, it may be appropriate to give communion to other Christians who share a faith in the real presence, if they’re not in a position to avail of the eucharistic ministry of their own denomination. And of course a nursing home is precisely the kind of place where you might find people with a limited ability to go to other churches.
Since just about exactly zero of what emerged from Vatican II was actually doctrinal, I suggest you learn the difference between scriptural, doctrinal, preferred practice, and common practice.
Then come back and tell the class what you’ve learned. We’ll wait here. But not for Eternity.