The txn may be available in the blockchain but they can't see its "redeem script" so they wont be able to see the block or time that you've set.
However, when the UTXO is eventually spent, the "
redeem script" will be a part of the Txin-script and will therefore be publically available.
Yes indeed, that's why I mentioned "
as long as the address isn't re-used".
But in this particular use-case, there's no way that the 'unspent transaction output' can be spent before the lock time passed anyways.
So IMO it's safe to say, no.