You can bet that if WBGO pre-wired that model for solar they'd not hide the fact. It would be shouted from the roof-tops. If it's not listed in the "features" then it's not there.
I just checked and it appears the 2019 Vista could OPTIONALLY be set up for Solar from the factory.
Quote:
Solar panel/battery charger wiring prep three-way, solar, plug-ready port located on roof and single port in exterior bay, for aftermarket installation , up to 450-watts
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I have the aforementioned "plug ready port" located on my roof and it's easy to spot. It looks like this (
mine is white). If you don't have one of these on your roof you no doubt do not have any pre-wiring installed: