Apple loves to make use of these specific capacitors. They were likely custom manufactured for Apple. 16V 33uF is sort of an oddball specification. And is another way Apple makes things less easily repaired by people in the know.
Honestly. These caps are on PPBUS_G3H which has a very large number of other capacitors. If you cannot replace this singular cap, it is unlikely to have an appreciable affect on this line. Although the fact that it's marked "Critical" on the schematic would lean me in the direction of replace it anyway. It's definitely better to have it that not, but its absence may not be super noticeable.
You are unlikely to find them on Mouser, Digi-key or other such vendors. Last I knew though they could be had on eBay or AliExpress, or referenced by specific part numbers, but I might have to do some detective work to find it.
UPDATE: Found a bunch of info, but this old forum post and some data from the manufacturer might be helpful in pinning down a suitable replacement. I haven't had luck finding an exact match, but that is not uncommon based on my recollection of this particular cap, which is a frequent point of failure.
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