Hello, line 2 of SITEUR is undoubtable a LRT. Both of Your arguments are not parameters of the definitions of light rail and metros. And the first one "aisloado" is even wrong, because at Juarez, there is a tunnel linking line 2 with line 1 to allow trains from line 1 to reach the joint workshop and depot at Tetlán (see https://archive.org/details/guadalajara-hacia-un-tren-ligero-de-vida/page/7/mode/2up on pages 73-76 in Spanish or pages 140 in English). Second argument does not even fit on several metro systems, because they are mostly elevated.
There is clear parameters, which make line 2 a LRT: trains at first. They are a lot shorter than metro trains, just compare them to the trains on line 3. Gives them the possibility to drive much tighter curves than metro trains of line 3 with appr. 24 m distance between bogies. And so on and so on. But next to all technical specifications, which make line 2 a LRT, one more strong argument for LRT is the joint use of the same train types on both lines 1 and 2 including the joint shops at Tetlán. Thank You.