Ooook nevermind, somehow I was still importing my old, local vtk.js and the script import is not working like that in Typescript/Angular.
I had to dynamically create the script tag for the import and NOW I finally have an up to date vtk.js
public loadScript(url: string) {
const body = document.body;
const script = document.createElement(‘script’);
script.innerHTML = ‘’;
script.src = url;
script.async = false;
script.defer = true;
body.appendChild(script);
}