When you book your stay via LHW you can tick a box to use one of your pre arrival upgrade requests.
This then sends a message to LHW reservations who will email the hotel asking if they can confirm the room upgrade. The hotel can give their response then or they can defer giving an answer until a week before check-in.

So it’s rooms only no suites, subject to availability, and at the hotels discretion and you might need to wait until a few days before checkin to get your answer.