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I pasted your code into an empty EPUB, converted it using kindlegen and sideloaded it onto my Oasis 2 running 5.10.3 firmware. The result was extremely thin lines for strike-through as you reported.
As a second test I converted the same EPUB to KFX and sideloaded that to see how it would look using enhanced typesetting. The result was a strike-though of a more appropriate thickness. (See image.)
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