Point of logic: it's a mainstream idea that there exists a type of masculinity that is toxic (strict subset) not that all masculinity is toxic.
If you google for "masculinity", "toxic masculinity" is the first thing that comes up. I'd never heard of "victorian masculinity" before, but that and "harmful masculinity" were the only other types I could easily find. Google also helpfully suggested "The culture of masculinity and its negative impacts on men" as a recent PBS Newshour segment that might interest me.
If you put the words next to each other for long enough, and you never see anything about "positive masculinity" or "altruistic masculinity" (which I just made up because I couldn't find any real examples), then you're going to create a culture that associates masculinity with toxicity. From my point of view, that's been happening for a few years.
The idea that brought masculinity into mainstream discussion was "there exists a type of masculinity that is toxic", but the way the public seems to have internalized it is "masculinity is toxic".
I agree with your concern about "toxic masculinity". However, I think creating a positive term to coexist with it is unhelpful.
Being masculine is always a good thing. When I was young, I was taught a certain set of things about being a man. Yes, masculinity implies strength. (Not necessarily physical!) However, abuse of that strength is not masculine.
Creating a term like "altruistic masculinity" implies that masculinity is a neutral thing that can be good or bad.