It's like you didn't read the article at all.
You don't even both to mention the "solutions" that these "millennials" are creating, probably because the specifics would be wildly underwhelming.
Regardless of the reason, you use these unidentified "solutions" to shame the writer. Well, the shame is on you.
A statement like "any good solution has only positive components" makes me think you have little experience of the real world.
In the real world, there are many, many, many problems with no good solutions.
I'm sitting in Amsterdam right now. 80 years ago, tens of thousands of our citizens were rounded up and sent to death camps.
But the problem of Nazi domination of Europe was solved using violence, violence fueled by hatred.
Toxic positivity is wildly destructive. You're gaslighting people and telling them that everything is sunny when we are sprinting toward catastrophe as fast as possible.