"So you are guessing that he had access to more than just a message possibly left in the US?"
Yes, as his business obviously makes that possible via opening voicemails and maybe even monitoring calls on his accounts.
There can't be very many cell-providers in Aruba; there are very very many "Croes" in Aruba, apparently all locals; and this particular Croes speaks near-perfect American english, and otherwise appears to be well-schooled and savvy. I think it is likely that he is the "guy" to go to for cellphones for the type of Arubans/Dutch/Govt types in Aruba----both the decent and indecent type------I can only imagine whose cellphones he manages amongst the folks in Aruba who are involved in this case so far and those who will be revealed as time passes. Hell, the message he and Beth listened to 3 times might have been someone in the States putting in a fix with the polis, prosecutor, VDS, or who knows what/who. I think the bombshell Beth has to drop (if there IS one) mat well originate from this scenario that has some of us so intrigued. And maybe I'm totally wrong, too.
Croes seemed to be the immediate eyes and ears on the ground for the Twittys...or at least I was left with that impression after the Greta interview. He just happened to have a teenager riding with him that night (no explanation of who or why), just happened to drive out to the beach rather than go directly to the HI to meet with Beth and just happened to run into some people who could identify VDS and know where he lived. And it just happened that he was able to connect with Beth.
Which is a long way of saying that I agree with you, there was a great deal of information known in the very beginning and Croes seems to have a played a significant role in developing that.