I think it's a standard Gold acknowledgement and it's normally done really badly or just ignored altogether, depending on the crew.

I have had it many times in economy where they come back having been told my seat number and name. They don't remember it by the time they come back and give me a look of "this guy is too young/poor looking to be high value" and do the confused guess of what my name might be...

They introduce themselves and thank me for flying. It's really embarrassing actually, especially when they assumed the guy in a suit next to me one time must have been the high value customer and asked him if there was anything they could do!

One occasion though it was done well. They welcomed me, thanked for my loyalty and apologised for the delayed boarding. Asked if there was anything they could do for me, I said "champagne would be lovely" and laughed and they actually moved me to a spare seat in club - but asked me to be discreet and said there wasn't any spare meals loaded. Lovely women, probably shouldn't have been allowed but it certainly made me feel like a "high value customer"

I am very close to GGL though, in the 4,400 range and it started when I reached about 4,000. I will reach over 10,000 this year though... Wonder if that changes anything