he only has a 2.2 times advantage over the Knight's general value of 1.10 Tons and even then he still downscales from that value by a significant amount considering how he's more durable than both Moldsmal or Shyren (Both having
0 DEF compared to Sans'
1 DEF), two of which can be defeated by an LV1 Frisk who scales to 2.42 Tons of TNT that Sans also downscales from.
Whereas the Frisk that Sans fought during the Genocide Run scales to 7.28 Tons of TNT, which is 3 times stronger than the value he downscales from, and
seeing how Sans was easily one-shotted by a single hit from Geno Frisk and
how the Knight can one-shot those who scale to its own value...
don't really think Sans is capable of tanking the Knight's slash as one might think.