In Charlie Angels (2019), in the closet room, Saint gearing Elean up:
Bosley: Tattoos are earned by Angels over time. You'll get a less permanent version.
Saint: Yeah, comms are concealed in the link.
What kind of "link" is Saint referring to?
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I think it's about communication link a.k.a comm.link. consider the conversation before you mentioned, from same page
Shall we fit Elena with comms?
I think so.
Oh, that in-ear radio thing you guys have?
Ah, even better.
It's a subdermal transmitter.
Works through bone conduction. See?
It says about a Sub-dermal transmitter, Sub-dermal transmitters are embedded into the skin, hidden from outside.
A subdermal implant refers to a body modification that is placed underneath the skin, therefore allowing the body to heal over the implant and creating a raised design. Such implants fall under the broad category of body modification. Many subdermal implants are made out of silicone, either carved or mold injected.
P.S: I'm not sure that transcription mentioned is correct, but since you insist on it, consider this as different POV answer.
I think you misheard "ink" for "link" as in their communication equipment is hidden in the tattoos.
According to the transcript you use as a source it even says: "It's a subdermal transmitter."meaning it is placed beneath the skin which means that covering it up with a tattoo makes perfect sense.