Another key thing I didn't mention was that at higher magnetic fields they no longer need to worry about plasma instabilities.

I believe quite a lot of work had gone into how to managing instabilities. From the video the more powerful superconductors are supposed to reduced those issues.

Although a Phyics graduate I'm not an expert in nuclear fusion.

They also mentioned that the "magnetic pressure" is the equivalent of 5000 atmospheres, I think I have an idea what they mean.

Taking questions someone asks about modes of failure; however catastrophic structural failure wasn't one of them.

Not a huge deal since there's scant amount of fusion fuel.