The confirmation that it does no harm would be processing with a two-bath developer after a pre-soak. If wet gelatin takes longer to absorb developer, you might get lower contrast "underdeveloped" negatives (assuming the recommended Bath A time is only just what's needed for the developer to soak in, rather than prudently longer), compared to pouring Bath A onto dry film. In order to really tell you'd probably have to run tests to see what minimum Bath A time is required for normal results with dry film and with wet.
i will contradict you. And yes, the analogy is correct.
No analogy is ever "correct" -- there are many that are incorrect at a level that makes them useful (electricity as water in a pipe system, for instance), but analogy always breaks down at some point.
The point at which the "emulsion as sponge" analogy breaks down is where you start to think of it as actually
being a sponge. Water doesn't need to flow in and out of the gelatin, it just needs to be filled and swelled; once that's the case, chemicals dissolved in the water can diffuse in and out as well. They'll diffuse more slowly than they would in unhindered water, of course, but
the water doesn't have to flow for this to occur. I reposted above the actual, simple, scientific test to determine if there's any advantage of disadvantage for presoaking with a particular film (independent of convenience issues like antihalation dyes). Rather than standing in the middle of the room screaming about how right you are, how about testing it? Then, whichever way your testing comes out, the next time this comes up (and it will, as long as we have film, developer, and water), instead of reasoning by analogy and giving thought experiments, you can say "back in 2020, I tested this using two-part developer X, and for film Y, the minimum required Bath A soak after a pre-soak is Z time (longer or shorter) than on dry film."
If you don't, I will, but it may take some time to load, shoot, and process enough film to arrive at the minimum Bath A time -- and that answer will only apply to one film (or, at best, one film family).