Try reading this, Chung: *** link disabled a reply***
You see, science does actually have the power to explain these things eventually, contrary to what you may have been led to believe by your studies on YouTube.
quoting from the said scientific hypothecation:
"Why the difference in gravitational signatures? The answer, the group found, lay in the crust’s thickness at the time of impact: Impacts to regions with thinner crust do more damage, easily sending shockwaves into the denser, underlying mantle — which, in turn, draws more dense material to the surface, creating a mascon. Regions with thicker crust, by contrast, are more resistant to impacts and internal upheaval. .."
The moon fits the bill for a hollow space object that was towed through a portion of space littered with debri such as the asteroid belt:
The asteroid belt is said to be the remains of the imploded planet Maldek and it would be easier to visualize the shell of the hollow moon, having some ability to rebound and produce a shockwaves that created mascon during its encounter with the asteroid belt. If it is a solid object, such rebound and shockwave would be less and the impact will burrow through the crust more deeply.
Science does actually have the power to explain these things eventually but in the meantime, a lot of hypothecation come into play. Even Einstein's work was a lot of hypothecation that eventually attained a crystallization in the academic view.
Consider my views as that offered using theoretical physics but the link you included is in the same nature and both views have the power to explain these things.
No, YouTube is not my main source and I consider it a valid form of information as many other media, in fact, NASA and the academe points of view are all represented in many video format available in the said site.