Ok, enough speculation.
Here is a test conducted using High Explosive artillery rounds vs various vehicles, including M-48 tanks (https://en.wikipedia.org/wiki/M48_Patton) w/c has an armor thickness (depending on the angle) of 110-220mm (178mm on the frontal turret). A GAU8 (https://en.wikipedia.org/wiki/GAU-8_Avenger) has a penetration of about 76mm.
Here is the test: https://imgur.com/gallery/gIjCo
They used 155mm HE projectiles (https://en.wikipedia.org/wiki/M107_projectile) and used M109 Howitzer batteries to fire them.*
*-seeing as this was done in 1988, I don't think they'd be using the newer M795 shells (from what I found the newer ordinance replaced the M107 somewhere in the mid-90s. https://www.globalsecurity.org/military/systems/munitions/m795.htm)
The results and I quote:
"The model predicted 30 percent damage to armored vehicles and tanks; however, 67 percent damage was achieved. Fragmentation from the HE rounds penetrated the armored vehicles, destroying critical components and injuring the manikin crew."
"...none of the damage to the armored vehicles were the result of direct hits-all the damage was caused by near hits."
"This test confirmed that US Army models did not accurately portray artillery effectiveness. Direct hits were not required to damage tanks and other armored vehicles"
I underlined "injuring the manikin crew" as it would need full penetration of the fragments through the armor to achieve this result.
These are shells with 22 lbs explosives.
H1 is trying to make us believe that Thor surviving explosions (w/c would include fragmentation along with the explosion) thousands of times more powerful is less than getting shot by a 30mm cannon (w/c used to be 20mm, but h1 is prone to move goalposts).
Hopefully this puts to rest the absolutely moronic opinion of bullets > explosions.