You will get access.
I flew MDE-BOG-IAH 2 weeks ago in economy (L). I was given access without any hesitation with my MP card (*G, of course) during my 3 hour layover in BOG, and I confirmed with the staff that I was allowed to bring a guest as well.
I had a flew flights within Colombia in the previous weeks on Avianca (all economy class), and I received access to the club in Baranquilla with my MP card as well. As far as I can see, you get all of the *G privileges.