First of all, the comic strip is not part of the televised universe. Thus, no matter if Shakespeare himself came back from the grave to write the definitive origin of The Doctor for the DWMagazine, if it's not on the screen, then it simply doesn't exist.
I really don't know why you would say this.
Doctor Who has never had a canon policy like
Star Trek or
Star Wars; there's nothing to say they didn't happen, and at least one DW novel was explicitly referenced as having happened off-screen in an episode (
The Monsters Inside in "Boom Town"). And no less an authority than Paul Cornell himself has said that it's entirely possible that the events of
Human Nature transpired twice in the Doctor's life -- once in the novel and once in the "Human Nature"/"The Family of Blood" two-parter. To say nothing of the fact that RTD and Steven Moffat have written DW novels, in addition to Cornell.
Obviously,
Doctor Who has tended to cherrypick what it wants to acknowledge from the novels --
Human Nature makes it, the Looms don't -- but that doesn't mean that they "didn't happen." After all, it's cherrypicked what it wants to acknowledge from DW TOS, too -- Sarah Jane going from meeting the Doctor again in
The Five Doctors to having never seen him or moved on with her life in "School Reunion." And DW TOS didn't have perfect internal continuity -- the infamous Season 6B and UNIT dating controversies.
Mind you, I say that as someone who's more than willing to toss out DW TOS as being a separate continuity from current DW for my own personal purposes.

But I don't think that it's fair to claim authoritatively that any of it is somehow "non-canonical;" there
is no
Doctor Who canon policy.
And, really, that's fine by me. After all, one of the great strengths of
Doctor Who is not giving a toss how it all fits together.
