Key points are not available for this paper at this time.
In short, the answer is "probably", at least to some degree. This note summarizes recent developments in hedge funds' Treasury futures and repo positions derived from the Commodities Futures and Trading Commission's (CFTC's) Traders in Financial Futures data and the Office of Financial Research's ("OFR") Cleared Repo Collection.
Barth et al. (Tue,) studied this question.