Translation: we looked at satellite photos of random buildings and determined that they were "camps" because of unspecified "hallmarks".
This is literally a Buzzfeed article. One of the people they cite once tried to do something similar by claiming an 800 year old mosque was demolished when it was actually the building next door built in the 90s(by his own admission[0]). In fact it seems they seemed to have been expanding/renovating the mosque[1][2].
[0] https://medium.com/@shawnwzhang/clarification-of-keriya-etik...
[1] https://miro.medium.com/max/1106/1*_OL9z1ndMVuqZQ7_XxwYLQ.pn...