"Section 1. Restriction on Entry. (a) ... the entry into the United States..., is restricted, except for those aliens whose petitions are accompanied or supplemented by a payment of $100,000".
OK, if I consider this interpretation, which of the following do you think will apply to already-approved H-1B petitioners:
1. Existing H-1B holder can amend their already-approved petition by "supplementing a payment" to become eligible for a visa and re-entry.
2. It's not possible to amend an already-approved H-1B petition. So existing H-1B holders can never satisfy the requirement. They cannot re-enter with H-1B visa anymore.
3. This EO is not retrospective. So already-approved H-1B petitioners (with or without visa) are fine.