Map Shows Mysterious US Spy Flight off Mexico Coast

The guy on X who spotted it infers this:
2. I don't think they wanted to be seen. I believe they launched and didn't get the transponder mode set correctly. I think that because the "other" mission went out quietly and flew in the mission area quietly. If they "wanted" to be seen to send some sort of message, they would have gone out transmitting ADSB data instead of the track being fixed via multi-lateration (MLAT).