It seems clear from context that he means it hedonistically, i.e. my own hedonistic experience is my only concern if I'm selfish; I don't care about what other people want or think.

Instead of trying to interpret the context, you should believe that I mean what I say literally. I repeat:

If you still think that you wouldn't, it's probably because you're thinking a 1% increase in your utility means something like a 1% increase in the pleasure you experience. It doesn't. It's a 1% increase in your utility. If you factor the rest of your universe into your utility function, then it's already in there.

In fact, I have already explained my usage of the word "selfish" to you in this same context, repeatedly, in a different post.

Psychohistorian wrote:

Utility curves are strictly arational. A rational paperclip maximizer is an entirely possible being. Any statement of the kind "Rational agents are/are not selfish" is a type error; selfishness is entirely orthogonal to rationality.

I quote myself again:

If you act in the interest of others because it's in your self-interest, you're selfish. Rational "agents" are "selfish", by definition, because they try to maximize their utility functions. An "unselfish" agent would be one trying to also maximize someone else's utility function. That agent would either not be "rational", because it was not maximizing its utiltity function; or it would not be an "agent", because agenthood is found at the level of the utility function.