I think what happens is neocities gets shared on some blog or something and there's a huge view rush for that day, then it drops off. Iv never been sure if views means site hits or profile views, both are counted in the API.
with checking google search console...there is a different result...the views of my site on neocities is around 47000, but on google is just 200...
I think Google Search Console just reports the people who've found your site with Google.
(And, apparently, everyone else.) ;)