As long as nobody is spouting off judgement there should not be any problem discussing the gate closure. WCC is working with the company to hopefully reopen the vehicle access. They have no problem with foot access, so if you are willing to hike, you can still climb there.
There is no guidebook, but Equinox is far from a secret crag anymore. The issue of secrecy arose prior to 2009 when the main avenue for access crossed private property. During that time traffic began to increase and some vandalism occurred on the property, both of which jeopardized future access. Because of that, the newfound stewards and developers of the Equinox had significant reason to maintain a level of secrecy.
In recent years the main access has been the logging roads off of old day creek road as opposed to the private crossing previously used, making the issue of secrecy less relevant today.
The Equinox has become a popular and well known crag for hard sport climbers throughout the northwest, and there is no longer anything secret about it.
The DNR doesn't close the gate because they want to keep climbers out, it's closed to prevent damage and theft of equipment used for logging.