They don't have a brewery in amsterdam. It's just their old brewery repurposed as a tourist attraction. All beer there is exactly the same as the ones at the supermarket.
¯\_(ツ)_/¯ Tasted good to me, unlike all the other Heineken I've tried. I suppose there are all sorts of things that can affect the taste. This was 20+ years ago, if that makes any difference.
Edit: nope, just checked and they closed the actual brewery there in 1988.
They own much,much more than just the Heineken brand. There's some remakably good beer under their umbrella. If you want to avoid their products you're almost always on the receiving end of the slightly more in touch AB-InBev.