≠ represents a gate [1], which the routing engine probably assumes you can go through; if it's not possible to open the gate, it should have an access=private tag added to it to indicate that it's not passable.

If you click on the mouse cursor button on the right and then click on the symbol, it will show you the details for that object.

[1] https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dgate