It looks like a combination of techniques. Some AE, some…not so AE.
For the words on his body, you might be able to fake it with light-colored text with a blending mode such as add and a displacement map effect, to make it look like it distorts with his skin. You’re also gonna have a bear of a time motion tracking it to the body. Perhaps that’s part of the reason for all the quick cuts?
Some of it looks like 3d particles in an actual 3d program. However, you might be able to fake it with Particular. Do you have Particular? You could make a precomp with letters and/or words flashing a frame at a time and use that precomp as your particle type. Have it set to be a random still frame.
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