Perhaps, but not the very traditional/generic Marriott stock photos that are for properties that are not open that don't have info. Since these were pretty specific in terms of visuals, I'd say that's probably what the rooms & public areas will look like.

FWIW - cache doesn't necessarily mean stock photos, just they're from Marriott/hosted. I went to three properties websites that I stay at on a regular basis to look at their photos & where I've posted pictures on my photo website I've personally taken of those properties, & my photos match the photos on the properties websites & the properties websites photos say cache as well.

If you're staying at Medellin after it opens, please do a trip report

Cheers.