There is some anecdotal linkage between measles causing gut perforation and some types of ASD
This still doesn't even touch what Wakefield was saying; which was that the MMR vaccine was the problem. And he was saying that because the companies that were making three separate vaccines didn't want a combined vaccine so they did a smear campaign.
As somebody who is not neurologically typical and who therefore generally keeps up with the latest in neurology just "because", my personal view is that neurologists take too fine a view of their area of expertise and stop paying attention to anything below the neck.
Which I think is a mistake because people who have allergies tend to miss out on entire food types. This means that they tend to be deficient in certain things and these pass through long and only dimly understood chemical chains to create things for the brain.
There is a very good set of studies that will eventually be done that is likely to prove a lot of issues are related to gut bacteria or the lack thereof of particular types of it. However, this isn't really neurology so neurologists aren't interested because they are looking about 6 steps down the line and seemingly aren't interested in the precursors.
So yeah, it's almost certain that particular types of gut damage will result in neurological abnormalities, but as you say the area of study is verboten probably for the next century or two. Unfortunately.