I will mark the trails as access=no as a precaution based on the information below.

My understanding is that a complaint about the main bluff viewpoint was made to the City of Mission suggesting that the bluff may be unstable. A social media influencer video shows the issue. As a result, the City of Mission has tapped off the trail.

https://www.facebook.com/reel/1641823676962088

I went to the City of Mission website and found on the "Hoover Lake Trail" webpage a new description saying

"Warning - Unauthorized Trails
The authorized trail ends at the viewpoint at the end of the logging road. Beyond this point, access is not authorized.

An unauthorized trail continues northwest and includes steep, unstable slopes, and a significant rock cliff with a drop exceeding 370m. 

For your own safety, do not use the illegal trail. Trail construction without authorization is prohibited."

https://www.mission.ca/parks-recreation/parks-trails/hoover-lake-trail

A recent AllTrails review also mentions:

"Hoover bluff trail has been taped off “not for use”"

https://www.alltrails.com/trail/canada/british-columbia/hoover-lake-loop-via-lookout