Nixon exerted a lot of energy trying to get dude deported. He was tight, not only with Rubin & Hoffman, but also with McGovern. It got resolved in '75, shotly after Nixon was forced to quit, but, coincidentally or not, that's when he started his five-year recording hiatus. Then, he starts recording again right after Reagan is elected, and at the exact same time as the so-called "October Surprise," which does have more than the ring of truth...
I dunno. It's prolly bullshit as well, but if you've gotta have a pet conspiracy theory, it's a decent one.