From what I understand the gap in spending is because of a combination of leftover money for blowouts/theming gaps and also for a revitalisation of the current areas of WDS, Disneyland Paris only recently had project stardust and it doesn’t really have much in the way of theming gaps/expansion pads.
Disney needs to convert Paris into a multi day resort otherwise the individual quality of Disneyland won’t do much to help the resort (see Hong Kong after its first expansion as it still lacks anything to do besides the park itself). I’ve also heard they are thinking of using some money on downtown Disney but that is just a rumour at this point