the url that you are referencing is wrong! the correnct url is:
https://modul-r.codekraft.it/wp-content/plugins/contact-form-7/includes/js/index.js?ver=5.4.1 and from my side, that url has no issues (apart is sooo slow i know).
The main domain is empty (only a splash page), so this is the reason why can’t find that file and you get an error! ??
And anyway what you’re saying is for sure at least in part true, because some commands have been added like api fetch. But it’s in the nature a form to have to fetch an api (o you will reload the page as 10 years ago). And have an api or search inside the document for an input or a textbox in some cases trigger smartscreen.
There’s a “merge” of problem, that makes the security ranking for SmartScreen as low to trig the RSOD but when you open the file directly because that’s the issue. Anyway better warn @takayukister that it’s something to keep under control!