"Correlation should not be confused with causation".
It is well-documented on here that you detest Khan, but don't let that blind you to the reality that, in the main, large capital projects in the UK:
- go hugely over budget
- fall years, and often decades, behind schedule
Even if Khan had any blame in the cited project, I would bet it highly unlikely that it was any more than a trifling part.
The whole capital project structure in the UK is a licence to underdeliver and overcharge (the public purse), and has been that way for decades.