I think that's a very important distinction. We are each in our own unique situations and it's best to keep in mind that even well meaning advice from someone else may not be the best advice for you.
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That bit of advice is give as a crossdresser to a crossdresser. "Crossdresser" in this case being someone who is not living as a woman or out to the world and wants to remain that way for whatever reason. Not someone who is already "out" to the world as you seem to be.
In my case, since I share a home with my wife, she obviously needs to know. My neighbor does not need to know, my mechanic does not need to know and my letter carrier does not need to know. My friends and other family members do not need to know.