Simply put, no.
Bullet drop is not nearly meaningful enough in either real life or WarThunder for that to actually work that way. To achieve that 90 to 100 LoS you are talking about, the hit would have to be at around 35°. That is a 20° bullet drop which is absolutely insane. To put that into perspective, the Sturmpanzer with it’s 150 mm Howitzer and subsonic rounds reaches a bullet drop of around 5° at 800 meters. Now we are dealing with rounds that go 800 m/s at the very least, so bullet drop becomes completely meaningless.
There are quite a lot of things that point towards the fact that these rounds were simply capable of going through a Panther’s upper glacis. First off, simulations.
In this first simulation we see T33 APBC being just about capable of defeating 80 mm at 60°. Any bullet drop that might perhaps be in this simulation (which at 200 meters would be basically none) is more than overcompensated by the much higher angle.
This second simulation is with M304 HVAP. This is a clean 80 mm at 55° degree penetration, not much else to be said.
Bullet drop very clearly isn’t the reason why these rounds perform how they do. That brings us to the second part which is actual US ballistic limit testing, using a long 90 mm cannon firing T33, T50 and M304.
Ballistic Limits

There’s a lot of information from this table. For example, T33 can defeat 4 inches (101.6 mm) RHA 280 BHN at 55° with a velocity of 2742 ft/s (836 m/s). It can also defeat 3 inches (76.2 mm) RHA 280 BHN at 60° with a velocity of 2629 ft/s (801 m/s), and BHN 320 with a velocity of 2645 ft/s (806 m/s). These last two values line up very well with the first simulation, in since there T33 has a velocity of 822 m/s.
There’s no 3 inch RHA plate at 55°, sadly, so we will have to make do with the CHA plate with 280 CHA at 55°, which is defeated with a velocity of 2313 ft/s (705 m/s).
If we were to look at a velocity graph for T33 (such as the one in “Terminal Ballistics Data, Volume III”), we can see that T33 fired from a normal M3 90 mm cannon achieves a velocity of 2325 ft/s at 1800 yards (1646 meters), marked by red lines in the spoiler below. Of course, this is once again CHA, rather than RHA, and it is also slightly thinner than an actual Panther, so the penetration distance is expected to be higher than what would be expected. Additionally, the ballistic limit table doesn’t quite state what penetration criterion is used.
However, TBD V3 does state RHA penetration values for T33 at an angle of 55°, specifically with Navy criterion which is what WarThunder emulated. Using it, it says that T33 defeats 80 mm (3.15 inches) at a velocity of roughly 2500 ft/s (762 m/s), which means a range of roughly 1250 yards (1140 meters), this being marked in green.
Terminal Ballistics Data, Volume III