Like many I receive hundreds (If not 1000's) of these exact same emails every year, Thankfully they go straight into my 'trash' folder. Since Domain privacy came into effect they work to old registrant records that are often years old.
Their intention is to target corporations and businesses (not domainers) that may pay a small invoice as a defensive measure, rather than check their relationship with the sender. Must work because as I say they've been at it for years. I'm sure the format has been picked-up by many others as well.
I wouldn't worry about it but now your on their radar expect a lot more such 'reminders' In order to stay above the scam- finders and disablers they do normally carry a very tiny text of this is a "Business Solicitation" at the footer