Can confirm... rode here last night. They closed trails all around Kinney Rd, including a small section east of the train tracks. The trails around the lake, including Waterloo Rd, and the short connector trail that leads to the Pink trails are closed, and full of hazardous obstacles. Might want to avoid this place until late next week when cleanup is done.
I spoke with the guys doing the install, who mentioned someone hit the trip wires. They cautioned me pretty heavily and I rode past everything. Everything was marked out well enough with pink "survey" tape, as well as yellow "CAUTION" tape. Official looking NJ State Park "Trail Closed" signs are at the trail heads, except for the iron gate. So if you park on Kinney and head in to the lake trails, you may run up on to an obstacle unexpectedly.