Exactly, I would expect the same. I had gotten the match, failed to complete the challenge, but then hit 40k miles without flying any TK flights. Was immediately awarded Elite. Most of my travel was on Ethiopian and my discount Y fares all credited at 100%. So ET flights credited to TK I think is a very good strategy.
Their dashboard will look weird if you are still within the challenge period. I would expect it to flip back to normal after that challenge and for you to be granted Elite.