The OP didn't say that they had both feet firmly planted on the ground. It might be that they just have the very tips of the toe of their shoes touching the ground.
If the OP is on a bike that has a very slack seat tube angle or has a seat post with an obscene amount of setback, then it's possible their saddle can be at the correct height and their feet touch the ground firmly while in the saddle.
Most of our saddle height and other aphorisms revolve around a road bike geometry. So I wouldn't quite think it necessarily good to use them for other types of bikes such as cruisers with very slack geometry or saddles with large amounts of setback.
Last edited by Iride01; 09-27-22 at 09:29 AM.