They are saying web based solutions often out perform LÖVE, even though you would expect the opposite because LÖVE doesn't have the bloat of a browser engine.
Love2D uses Luajit and directly calls established game libraries. The CPU usage should be far better for 2D games, luajit is faster than a browser's javascript jit. You can also create single exe games that are a few megabytes and not a few hundred megabytes.
