CMs should NOT be asking anyone to take off their shoes. That is against the policy. The rule is that if the shoes fit their feet appropriately (I.e, if they're not wearing big brother's shoes which are clearly 3 sizes too big), then it doesn't matter if they are three-inch platform sandals, CMs are required to allow them to ride. But bear on mind, your kid may look like he or she is touching, but if anything can pass between their head and the bar (a ticket, a flik card...anything no matter how thin), then they are not tall enough.
The wording you provided is a bit off. The rule is that If their shoes were obviously altered to meet the height requirement, the CM should ask the guest to return with the appropriate footwear.
It seems to be inconsistent, and your mileage may vary. keep in the CM at the entrance and/or their manager, if it comes to that, will have the final say.