Rules Lawyer: Thunderwolf Mounts and Multiple Modifiers

Do Characters on Thunderwolf Mounts with a weapon that doubles strength strike at S9 or S10?

I've heard this coming up more and more, and debated the rule all over, including with the guys of Forge the Narrative, the 11th Company, and Team Stomping Grounds. Obviously, there is debate and the answer isn't abundantly clear, but I'm here to settle it.

An Iron Priest on Thunderwolf Mount hits at S10.

Now, let's look at why:

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