How much of that is due to the reduced capacity and services they're running at this point though? Adding on Sundays and doubling the trains per hour would certainly increase the passenger figures.
Obviously, it might be amazing that the existing passengers get a faster and more pleasant journey with less changes but it would also have been nice for money to be spent outside of London in the other major cities which could have benefitted much more from much less investment.
Nonetheless, what's done is done. Investment in public transport makes no sense anymore. The country can't afford anything anyway now. Look at the graphs of public debt. Lockdowns and associated measures were as bad as ww2 for the public finances.