I can tell you that I have had 6 2018 13" MBP's and all 6 have had repeating keys within 10 days of opening the box. I am currently typing on the 6th. It had 2 days of repeating "e" key and so far not so much repeating, but my writing has been very minimal in the past week or so compared to my recent use.
If you buy one, expect to have an issue. They will repair if the keyboard fails within the fist year. I am guessing with the amount of problems being reported on the 3rd gen butterfly keyboards (2018 MBP and Air's both reporting issues) that they will have to extend their keyboard program to the 2018 (3rd gen keyboards) as well. -
https://www.apple.com/support/keyboard-service-program-for-macbook-and-macbook-pro/
If you need a repair you will be without your computer for 4-7 days (from what I have read) as they need to replace the entire top case (bottom half of the computer). If you are asking for my opinion, I would tell you not to drop the $1700 - $3k+ on a machine that will most likely fail. But, as have read, I keep trying - I love everything else about the computer and our entire family is in the Apple ecosystem - I don't know how to get out.
You could buy the 2017 MBP (non-touchbar) and you are 100% in the keyboard program (double check), or you can find mint/like new 2015 MBP online and they have the old workhorse keyboards.
Good luck.
By the way, I can't say if that manager is honest or not, but they do know that there is a problem.