TechWhirl (TECHWR-L) is a resource for technical writing and technical communications professionals of all experience levels and in all industries to share their experiences and acquire information.
For two decades, technical communicators have turned to TechWhirl to ask and answer questions about the always-changing world of technical communications, such as tools, skills, career paths, methodologies, and emerging industries. The TechWhirl Archives and magazine, created for, by and about technical writers, offer a wealth of knowledge to everyone with an interest in any aspect of technical communications.
It is probably just a verbal tic like "have a nice day", "see ya", or "paper
or plastic". I will have to check with my boss, but I think they thanked me
for coming in for my interview here.
They thanked me for coming to the restaurant I ate at last night. I can
only assume that they want me back.
So, no. I don't think it is secret code for "don't call us, we'll call
you". HOWEVER, it could be secret code for "we have not made up our minds
yet so we are being blandly,
you-can't-sue-us-for-making-any-implicit-promises neutral".