let me dumb it down for you to understand. There are no entry requirements placed on a DTV holder. There are no lines of DTV holders showing proof of funds or proof of ongoing courses at Immigration. There is not a single report of a DTV holder being rejected entry due to failing to provide a current soft power course or any other DTV application requirement. There are no entry requirements for a DTV visa unlike a visa exempt entry that actually has entry requirements. Your suggestion that the OP should have ongoing soft power courses booked to facilitate entry is a requirement that only lives inside your head.
there are no checks when entering. There is no guarantee that even if the OP is enrolled in a valid soft power activity that they will not be denied entry. An IO can reject you on entry at any time without reason. So a pointless post. Currently there are zero reports of any immigration checks on entry.