The dimensions and weight are unfitting of 5.2 inch phone. 154 mm is roughly 6.06 inches, so the bezels would be massive. The leaked dimensions provided by Onleaks seem a lot more plausible.
Nexus 5: 137.9 x 69.2 x 8.6 mm
Nexus 5X: 146.9 x 72.9 x 8/9.8mm (Onleaks)
G4: 148.9 x 76.1 x 9.8 mm
Nexus 5X: 154 x 76 x 10 mm (Amazon India)
Nexus 6P: 159.4 x 78.3 x 6.6/8.5mm (Onleaks)
So, I would take this leak with a grain of salt
If the specs are right (1080p, snapdragon 808, 2GB ram, 16GB storage, 13mp camera), then those are exactly the same specs as the Xiaomi Mi 4c, which sells for ~$200.
So maybe LG is trying to make a mid-range (populist) Nexus and sell it on the cheap?
The 5X will likely start at $399.
Does the 4C have a front stereo speakers, fingerprint sensor, OIS, and laser autofocus? Those could add to the cost of the 5X.
I do wish LG and Google were able to keep the same price tags as the 2013 Nexus 5 (starting at $349).