So that's what those red arrows were about.

Post mounts like IS mounts can be put on the front of a fork leg, it's all about measurements from the center of the axle.

As long as the two brake mounts are a certain distance from the axle and a certain distance apart it can be done.

Here's couple on rough additions to a tech drawing to show how front post mounts would look.



Here's what a IS mount on the front looks like.