K.B.
No, it does not mean he's ready for potty training. It just means he doesn't want to wear clothes and stuff. Has nothing to do with bladder readiness.
When his diapers stay dry longer between wetter, or is less wet then that is a sign.
Try duct taping his diapers on at night, unless his a skinny kid then he'll weasel right out of them, lol. You can also try putting his zipped pajamas on backwards but if he can slip out without unzipping then I'd resort to taping his diaper on. Put waterproof pads under his sheet. Nothing wrong with disciplining him for taking his diaper off when he knows he's not suppose to.
K. B
mom to 5 including triplets