The taxpayer is paying for these lies
I don't think that's a useful framing.
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
The taxpayer pays for all the lies.
If you think delays in aerospace constitute "lies," you're not going to have a good time following any aerospace company. Unexpected delays are par for the course.