From experience, what Celebrity says and what happens are quit different! Before you board, if you ask for a wheelchair it will be provide - with a pusher to your cabin or a lunch venue and just ask to leave the wheelchair. Walk down almost any hallway and you will see wheelchairs with the Celebrity name on the back that passengers leave outside their cabin. At the ov cafe, theater, or cafe B - celebrity wheelchairs. Leaving the ship on an excursion, no problem, they even have dedicated crew at the gangway to help wheelchairs on and off(anyone who has been on a Celebrity cruise has seen that). Disembarkations, there is a pusher to assist you all the way to taxi or car service.
while we travel with our own wheelchair, there are times when we still need to use a chair that has the Celebrity or ships name on it.
Hal