Keep in mind that your IP can change, but it generally doesn't do it that often.
VNC means "Virtual Network Computing" and there are plenty of VNC servers. I don't see a open VNC server on that IP, tho I do see what looks like AsusWRT running with possibly DNSCrypt, so those type of people are likely to have a remote connection open from time to time.
Going by the other thread I linked to, It would appear that someone else gives VM the IP addresses and then they issue warnings. Perhaps their lookup script is attaching the wrong account to the IP. It might be worth you phoning up to see if you have had a different IP issued over the past few days.
---- I do not work for VM, but I would. It is just a Job. Most things I say I make up and sometimes it's useful, don't be mean if it's wrong. I would also make websites for them, because the job never seems to require the website to work.