LOL!! Caught you in another mistake. If you think buying foreign currency (there is more than one currency, by the way) is the same as buying U.S. Treasuries, then you're sillier than I previously thought.
If you want to infer how much they buy in Treasuries, a good starting point might be an article about their purchases of U.S. Treasuries.
But then again, you always confuse their total foreign reserve holdings for U.S. dollar holdings. You could find an article that tells you how much they buy and you still wouldn't understand it.
You are the one "caught" LOL!
You can't prove your point.
China's peg is to the dollar. Not anyone else. Currencies plural is a convenient ambiguity. But basically a fictional ambiguity... It is the U.S. dollar that is the big enchilada here. The currency of their "main enemy" [ as officially described in all Chinese Communist military literature ].