(or maybe you just have a similar writing style)
Devil's advocate: why does it matter (apart from "it feels wrong")? As long as the conclusions are sound, why is it relevant whether AI helped with the writing of the report?
Pretty much everyone has heuristics for content that feels like low quality garbage, and currently seeing the hallmarks of AI seems like a mostly reasonable one. Other heuristics are content filled with marketing speak, tons of typos, whatever.