True. But it has everything to do with the failure of Crossrail to deliver any passenger service at all for the past four years
No it hasn't, Crossrail is c 3 years late (split hairs if you want), or expressed as a proportion of the programme length, less than 25% late. Such a delay, whilst regrettable, is hardly exceptional in many countries including the UK. Arguably, the lack of Crossrail in the last two years has had very little impact on passenger travel in Central London during a period of what can be described as historically low demand. If we are looking for a scapegoat here, I don't think selecting Bombardier stock was the wisest decision.
TL is a different proposition in terms of maximum core throughput, - designed (in both infrastructure and rolling stock) to deliver up to 24tph, within the limitations of 150year old victorian infrastructure, and multiple feeds from four already congested main trunk routes through London suburb. The tests conducted in 2018/9 showed that it could provide at least 20 tph when using ATO, and all approaching trains destined for the core given the appropriate priority.
All of this has nothing to do with the title of the thread, i.e.
'construction updates and progress towards opening'.