Black_Diamond
This is Felt Lake. It's private property for Stanford University. There is no Gate A in the middle of this field. So at minimum, this note is misplaced, and the general public should not be using this non-public property.

The San Jose Mercury News also states that this area is off limits. https://www.mercurynews.com/2008/12/28/felt-lake-muddy-portal-to-stanfords-past/#:~:text=The%20132%2Dyear%2Dold%20lake,romantics%20and%20skinny%2Ddipping%20revelers.

It should also be noted that the National Park Service's information about the Juan Bautista de Anza Trail is an odd assortment of unrelated trails. Some of which are certified and uncertified routes. Some of it is historical in nature and doesn't reflect modern property ownership, which means that you're not guaranteed to be able to use such a path, if you're using the NPS information. There are no NPS certified trails in the field around Felt lake.

There is nothing that can be added to the map based on this note. Sorry.