This is an assumption, but it's likely that they've been keeping tabs on all applicant portfolio sites over the months, and are now going through their decision processes. Since applying, my server logs have been showing hits from IP addresses that resolve to MIT. Not full on visits though, as most of the time only the landing resources are fetched and sometimes there is no fetch just, what seems to be, pings to see if the site is up. On few occasions, a headless Chrome driver was used to scrape the sources/dependencies for my site.
This started with ~25-30 hits a day after applying and providing then the url to my site, then ~40 for most of January, and finally a dead stop around January 29-30. Haven't seen any since then.
Analytics services that don't have access to server logs will not show this. If you have access to your hosting server space, check the 'logs' folder for your log files. Then search for IPs within the files that begin with '18.' and look them up here https://ip-address.us/lookup/<ip_address_here>
Don't be embarrassed. I'm in the same boat. If they can't see past our GPAs to see our work and concepts for what they are, then it's on them really. We can't lose confidence as a result of another's opinion