Honestly, that just seems so dumb to me. Don’t call candidates who are currently employed and wrote: “please keep this discrete” in their cover letter in the middle of the workday! That’s what emails are for.
Rampant thoughtlessness. Some employers are serious jerks about even faint signs of looking at greener pastures (fucking sociopaths).
In other news, my spouse is about ready to abandon ship, sent out a round of apps this morning, and already got requests back for two interviews. I’m super proud, despite my irritation at some HR people.