I have no dislike for London whatsoever, and in my comment was clear that as the capital city, and the UK's (if not Europe's) only global city, London justifies enhanced expenditure on transport.
As for the statistics, you are right to an extent and I hold my hands up! I have been interested in regional disparity for quite some years and I hadn't realised that since 2017 the ONS have been using experimental models to try to allocate tax receipts more fairly between regions. They never used to.
Even on their latest estimated model (it is estimated because HMRC don't actually tax based on where profits / earnings are generated, but based on where the person lives / company is registered), Corporation Tax allocated to London amounts to double the share of London's tax revenue than everywhere else in the country (every other region - including the non-London South East being virtually the same). Yet VAT, which taxes consumption, is much less of London's tax share than elsewhere in the country. To an extent this could be due to Londoners having to spend a larger amount on buying or renting property (VAT free) and less on normal spending, but not enough to justify that disparity. So either London based customers are considerably more profitable for companies as those everywhere else (inlcuding in the affluent Home Counties) and at the same time Londoners spend less money (which seems counterintuitive to me!) or the ONS model (which they themselves call "experimental") is still skewed to the effect of London-based head offices.
Going back to the topic of TfL finances, though, why should the pre-2016 funding model be used? TfL losses, pre-Covid were almost entirely down to the net loss on buses (£722 million in 2019). That's £80 per man, woman and child living in the GLA area. By contrast total expenditure in Greater Manchester on buses (including supported transport and concessionary fares) came to £78.8 million in 2019, amounting to £28 per head of population. Yes spend more, but three times as much?? On an area which on any measure is richer and can afford to pay more? And that's before you factor in post-Covid working from home, too!