Hey there @fingular
Resources included in the download section for each tutorial ( available for paid subscribers only ) will vary for each course. It's courtesy of the tutor(s) to include their samples or presets if they are free to do it ( understand that some samples and presets might come from paid packs, therefore the exclusive user license they have for those don't allow any redistribution ).
When it comes to any thing 3rd party like plugins instruments & effects, most of the time you'll find the preset along the full DAW Project file included in the resources. That said if you don't own the same 3rd party effect or synth, you won't be able to load the plugin of course. Again, it's pure courtesy of the tutor(s) to freeze tracks or include audio stems of 3rd party instruments but this won't be the case in many tutorials.
The spirit here is more about how producers are working in real life in their studios and with the gears, plugins they choose to use. Best thing to do is to follow along the video tutorials and learn about the production process, if you come across 3rd party plugins that you don't own, you might look for a demo version on the web, but the best way is to find an alternative that you already have and use it to recreate the process. Same goes if you're using a different DAW than the tutor's one, just learn from the videos and try to recreate the track in your own DAW using your own plugins : that's indeed a very effective way to learn & progress IMO.
Hope this helps & clarify things about what might be or not included within each tutorial