The van was actually parked in a different spot (but the same parking lot) in the Google Maps images vs the Twitter images (compare location of van to location of the yellow pedestrian walking signs in the Twitter images).
https://www.videoblocks.com/video/shoppes-at-the-waterways-sgwfphcygiurj64n7
https://www.videoblocks.com/video/aerial-video-shoppes-at-the-waterways-r5edcjakxiurh8u68
Stock videos appear to show the van parked in the same spot in January & March of 2018. Hard to tell for sure though unless someone wants to pay $179 for the full quality footage, kek
That mall had a false alarm on a shooting 12/23/17