@Fwelin
Nah, that’s just Josh Haber not giving a damn about anyone’s canon but his own. Also, Shadow Play seemed to support the Journal, given that Starswirl didn’t remember them as being anything other than a couple of fillies who he took into his tutelage. Most notably, he doesn’t say “Oh my, you’ve become alicorns.” kind of implies that yes, they were princesses prior to being his students.
The whole reason Luna and Celestia were so special was that, being alicorns, they could move the heavens without causing so much magical strain on themselves as to lose the use of their magic, and it only took one of them versus a group of unicorns.
While we don’t have solid canon that clearly states they were, we do have soft canon that does, canon that supports that soft canon, and a lack of definitive canon that they were not.
@Fwelin
Or they weren’t aware that a non-natural alicorn and a non-alicorn can produce an alicorn, with them saying that they never seen a alicorn born in Equestria (look up the transcript to see that often missed detail).
@Background Pony #22BB
We don’t actually know if they were born with wings anymore. Ths Journal of the Two Sisters is the only official source saying they were born this way, and it’s of questionable canonity given just how severely episodes have contradicted it (most notably Shadow Play).
There’s also that one statement in The Crystalling that, while not conclusive due to wording loopholes, HEAVILY suggests that Celestia and Luna were not aware of natural born alicorns being possible.
@Prysmfox
Being an alicorn automatically comes with the title. And you apparently don’t have to actually do anything to be an alicorn, unless Flurry somehow saved the world from within her mother’s womb.
@FloydPinkerton
Great an Au where Twilight didn’t mess with Starswirl’s spell and Celestia tried find other ways to make Twilight a princess.
Judge: “And first prize goes to Twilight Sparkles for 100 burgers in 30 minutes, you’ll be getting a year supply of free burgers.” Celestia pops up behind them and whispers in their ear and hands them a bag marked “Not Bribe”. “…and the title “Princess of Burgers”.”