I don't think it's so unlikely. To send a ship to mars, they "only" need a fully fueled ship in low earth orbit. It may be the case that they need to do that anyway as a demonstration for the Artemis program. If they have fueled the ship in such a test, they only need to push the button and send it off to mars. So i would guess like a 55% chance they do that in 2026, when such demonstrations may be needed on the Artemis timeline.
Simply put, I believe Elon Musk is a conman along the same vein as Elisabeth Holmes but simply more extreme and yet to be fully noticed. Thusly, anything he is involved with should be looked at with deep suspicion in my opinion. He frequently misses deadlines and does not deliver on promises when it comes to works and businesses such as the Hyperloop, Cyber-truck and SpaceX as well. Even rudimentary research would show this but I personally would recommend the work of Thunderf00t on YouTube or Common Sense Skeptic or if one is more reading inclined this article should suffice:
https://medium.com/@DevinGates/elon-musk-the-man-the-myth-the-con-75b7aee73e90
There will be no landing on Mars by SpaceX let alone colonization of the planet. Mark my words. This man and everything he's involved with are just over-promised cons.