Well, to reach an agreement here we'd have to define "sufficiently primitive life" more exactly
I agree that the precursors of life can float around through space to be deposited anywhere, just like any other chemical. Trouble is, life is characterized by a spectrum of characteristics, even the term "species" really has no definitive meaning. I stand by my logic that life cannot survive interstellar travel, but its chemical precursors might. But I understand that the dividing lines between "chemical precursor", and "primitive life", and "evolved life" are fuzzy. I accept it. That's life.