Your reasoning is solid, but you're not a KGB agent with a financially challenged background and extreme paranoia with likely assortment of other psychological -pathies that shape your entire worldview.

Also, Putin sure seems like someone who isn't planning escape routes or anything - he's burn everything and everyone around him, maybe even himself, if he had to give up power (which we've been witnessing for a while).

Even if he had to flee Russia and rely on stashed wealth and secret locations and whatever, he would have probably used another framework, not some already well-known American citizen that does finances.