Yeah, but the whole show is told from the perspective of his frequently envious friend, Ted, and Ted is regularly shown to be an unreliable narrator. The blonde character also gets long-term, deeply involved with Ted's primary romantic interest, and there are hints that maybe blonde one's exploits are overstated because Ted's still not over it or otherwise remembers it through a negative perspective.

He also works in an I'll defined seemingly meaningless job at an enormous faceless banking conglomerate that pays him ludicrously well

Sir, I'll have you know that, "that blond guy" is none other than Neil Patrick Harris.

His acting range covers an immense range of characters; from teen heartthrob Doogie Howser, to the psychic GeStaPoesque Carl Jenkins, to comedy villain Dr Horrible, to playboy Barney Stinson.

He's gay but he plays cis-het womanizing sluts so well that a lot of people assume he's a cis-het womanizing slut IRL.

Unlike his fake slut persona, he's actually a real magician and does the tricks in HIMYM himself. He even has his own card deck with a secret code in it https://store.theory11.com/products/neil-patrick-harris-playing-cards

"that blond guy" indeed. Herumph sir. I say herumph to that!

It's never explicitly acknowledged like that, but basically, yeah.