If the bolts were over-torqued by the factory to the point that the factory stripped the threads out of the aluminum, all of those drains would have leaked like a sieve ever since day one.
I didn't see anything about leaking drain plugs or the oil filter screen plate leaking before this oil change was attempted.
Looking at the original post,
"...
Long story short, all four bolts on the bottom caused damage. Both drain plugs and one of the filter-screen plate stripped the engine threads completely. I can't re-screw the bolts back in now. There's nothing catching onto the bolts now. The thread on the bolts look perfect. The other filter-screen plate bolt broke off inside...."
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Note, he says the four bolts caused the damage.
To my way of thinking that means he either cross threaded them and wrenched them in or he did not use a torque wrench and he simply over-tightened them with a wrench.
Likewise, "the filter-screen plate bolt breaking off inside" sounds like a typical case of over-tightening the bolt.
Those small bolts on that filter screen and on the oil filter cover are only supposed to be torqued to 4 lb/ft of torque. That's almost nothing. In fact, when I'm tightening those little cover bolts, I'm always surprised when my torque wrench clicks, telling me the torque has been reached.
As it stands now, if I was the dealer I would chalk it up to user damage which the warranty would not cover.
That leaves having Heli-coil's or similar screw thead insert's installed by a professional, the only easy option.
Sorry to be such a grump but this is the way I see it.