Hello,
when I was there (Sunday around 14:00), I saw that there cannot be a connection between Rue Terarken/Terarkenstraat and Rue Villa Hermosa/Villa Hermosastraat. The terrain is hilly, Rue Terarken is a few metres below Rue Villa Hermosa.

At the end of Rue Terarken, where there's the Brontë sisters plaque, there are a wall and a closed garage door. Right above the garage door, there's open space, and a glimpse of the area can be had.

At the end of the straight part of Rue Villa Hermosa, there's a construction site. Facing left, where a "barrier:gate" and a service road are mapped, there's indeed a fence barring the entrance to the site, and some open space that can be interpreted as the service road. However, it cannot be connected to Rue Terarken due to the slope: at most, the roof of the garage accessible from Rue Terarken might be reached (but only by those with access to the site, that is fenced off to the general public)