Here is an example of your ‘rest day’, right off the bat:
Here is another example of your ‘rest day’:
250 pushups and 400 air squats. Then overhead carries and single leg rdls. On a rest day.
What you replaced the program with is literally the most impossible thing I have seen. There’s no telling if you can do the 10K challenge as written or not, because you just didn’t do it. But if you did it AS WRITTEN, I’d wager you’d get through it.