This reporting/rumors have been an utter mess... if you search the lady's name on Instagram, there's an account with witness video as well... the man being rolled away on stretcher while receiving chest pumps by EMT... and the officer "pacing" in another.. but you can better see how the building itself looks on the inside...
Anyone, more background on her:
https://heavy.com/news/2018/09/amber-guyger/