Well, in the sense that it's possible to be eating zero calories in the time between meals. You still need the meals. If you're just looking at brief snapshots, it doesn't tell you much.
It's great that we've made so much progress that people can say "it's just 90% renewable for 30 mins" but that's a result of decades of hard work.
This is not a serious system. We've done a bit of work on th cheap, easy part. Installing some solar panels is easy and costs almost nothing. The storage and transmission of power is 90% of the actual work!
In Australia they keep reducing the number of synchronous generators that are required to be connected as they gain more experience.
Renewables started as fringe tech and are now a trillion dollar industry. But they faced skepticsims at every stage along the way.