Author here! I struggled with the word "modern" – I could have said "current gen" or "post-React" or even "Solid-inspired" frankly, but I thought "modern" was succinct with the right amount of punchiness.

Obviously a lot of these techniques are pretty novel, and maybe they won't stand the test of time. Or maybe a new browser standard will make them obsolete eventually. But for now these seem to be the current wave anyway.