That is the exact same response they published in April 2021 except the date was 2021 not 2022.
I would guess its on the backburner until they sort a number of other issues they are having with the whole range of their powders and facility upgrades.
Someone said that a Canadian firm may be looking at making TB and given the number of us asking about it surely its profitable?
I would say if you have enough to last you til 2023/24 then crack on, otherwise start looking for what you are going to turn to when your supply runs out.
I realise the above is all assistance short of actual help but I think that's the way it will be.