Yes.

>You are probably like almost every other person who has ever lived, you don't matter at all. Nothing you do will meaningfully echo throughout history.

That sentence is basically the definition of nihilism. I don't see any possible interpretation of it which isn't categorically nihilistic.

>I suggest simply you engage in "nihilism" on a few more things you have no control over.

I get what you are saying, and broadly agree with it, but that wasn't the point of my comment.

I wasn't commenting on whether or not your take on the subject is helpful or not, just that the delivery of "you don't matter [...] enjoy it" is off-putting to the many people who don't take such a nihilistic viewpoint, and probably does no favors in convincing them such a view would be beneficial.