ADA doesn't work as DEI does.
ADA says you have to provide access to someone in a wheelchair in some manner that gives them equal access, regardless of there actually being someone in a wheelchair*. Not that you are encouraged to have someone in a wheelchair to provide access to as per DEI.
it also allows for two separate provisions. You can have stairs for "normal" people, as long as you have a ramp for "disabled" people. DEI would be "you can't have stairs, you can only provide a ramp as that is the equitable solution".
#late add, ADA also allows for separate entrances, not very equitable. you have to provide AN accessible entry, but it doesn't have to be the front door. now most good architects are going to do our best to make sure it is the front door, but ADA doesn't require it to be the front door.
*ADA also makes several provisions where ADA access is not required in work areas. somewhat ironically, Air Traffic Control Towers are exempt from ADA. (206.2.3.6_"In air traffic control towers, an accessible route shall not be required to serve the cab and the floor immediately below the cab"). I very much doubt DEI makes similar exceptions.
ADA has a lot of "common sensical" allowances that the more ideological focused DEI wouldn't allow.