"In late 2020
Bulwark was dry-docked for phase two of her optimised support period.
[42] The ship was to remain in dry dock prior to undertaking a phase 3 "recertification package" ahead of her planned return to the fleet in 2023.
[43] In mid-2023 it was reported that the ship would not be ready for active operations until sometime in 2024."
Looks an awful lot like not useable for 4 years, which is what I wrote.
Whether Cartlidge has been interpreted rightly, I don't know - this seems drawn from this single line answer in Parliament:
"I can confirm HMS BULWARK will be regenerated from extended readiness and maintained so that she can be ready to deliver defence outputs if required."
Due back in 2023, then sometime in 2024. Cartlidge's comment seems to be an avoidance of actually saying that it's done because that would look like it had been left to rot without plans to replace it.