That's the same chart I googled up. Judging from a quite recent press release it seems like the project is years behind schedule and the taxiway is at best inactive and it looks to me like it doesn't really exist yet, still under construction. Aerial imagery from this year on Google Maps shows it as bare dirt. This image[1] from the October 22 press release seems to show the new taxiway as under construction.

The final thing is the video from the passenger on TikTok shows the rescue truck kicking up a cloud of dust, making it seem like they were crossing bare earth.

1: https://static1.simpleflyingimages.com/wordpress/wp-content/...