Yeah, that’s a standard invalid traffic (IVT) disable notice from Google. They don’t say what triggered it because of how their detection system works, but usually it’s due to low-quality traffic, bot hits, or aggressive refresh/ad stacking setups.
You can try the appeal, but unless you give them a full breakdown of your traffic sources, user behavior, and what changes you’ve made, they’ll likely reject it. Even then, reinstatements are rare.
Where was your traffic coming from mostly? Organic, paid, or something else? And were you using any kind of refresh scripts or iframe methods?