While it is a "milestone", we need of course to put it in perspective:
The 11 MW produced (with 40 MW of input power) is lower than that achieved in 1997, resulting in a ratio of fusion power to heating power of about 0.3. However, the power was sustained over a longer period of five seconds. Indeed, officials say that they now want to focus on producing “sustained” fusion energy rather than optimising a brief peak performance.
"Mastering" fusion on Earth is an impressive achievement in itself, but it's nowhere near practical for actually producing energy, since it takes in a lot more power than it puts out.
As to tritium, while it is what's being used currently, I don't think that's where we're really headed. They are looking at using Helium 3 from what I gathered, which is sort of "abundant" on the Moon, and one of the main reasons there is a "sudden" renewed interest in going to the Moon and installing bases on it. I have no clue (not my area) whether fusion with Helium 3 is at all doable with current, or foreseeable technology.