The claimed features (see pg 5 of https://www.wyden.senate.gov/imo/media/doc/wyden_hemisphere_...) operate at a cell service level, so as long as your phone is still connecting to base stations the answer would be "no." Take, for example, "Linking multiple devices/phone numbers to an identified target" -- even if you use Signal on two phones and never do regular text/call, if the two devices travel together (e.g. connect to the same carrier base stations) one can make a guess that they are related. This has much wider applicability than the drug investigation mandate: e.g. you could use such capability to identify who is meeting with which investigative journalist.