Idk how true that is, it’ll be highly dependent on what you’re trying to dissolve.
This sounds to me more like the advice I’ve heard for using isopropyl for sterilizing equipment and surfaces, its more to do with how quickly the pure stuff evaporates. Evaporate too quickly and it doesn’t sterilize, whereas 70% is best of both worlds.
For the texture/pattern around the edges where the squares are cut off; I would either remove them or taper them down towards the edges, so they are less likely to catch and eventually pull away.
Otherwise, this is a very cool idea that I’d like to see updates on!