If not SpaceX, it would be all NASA. NASA lies about their budget all the time, with massive overruns. For example, the Artemis overrun exceeds the entire cost of Starship development so far [1].
[1] https://www.space.com/nasa-sls-megarocket-cost-delays-report
I’m saying this with confidence because it’s the established history of SpaceX critics. Everything from reusable rockets, space internet, full-flow staged combustion, etc.. has had its naysayers that all shut up and found something new to critique once SpaceX showed it was possible and even profitable.
At this stage you may as well just come out and say “I don’t like Elon”.
I'm not going to look up the original context of Elon's alleged lies, but from what's written here they just sound like long term project goals rather than formal lies (implying things like malicious intent or fraud).
If anything, maybe the only reason he didn't meet those goals is due to his social media addiction.
Why are you so upset by the aspirations of others?
The reality is that other companies consider SpaceX's goals so preposterously unattainable that they don't even try.
Or to put it another way,
> At SpaceX we specialize in converting things from "impossible" to "late."