[AJRF]

Telegraphing can simply mean the act of displaying something outwardly.

Used extensively in the context of E-Sports when someone does something that the other player can see and prepare for.

[jcadam]

Or in boxing, "telegraphing" a punch, where you draw your arm back making it obvious what you're about to do so that you're opponent can prepare to block/dodge/counter/etc.

[AJRF]

Exactly correct. Perhaps your example is a little more relevant than mine.