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Edit: Will also point out there is a demo for the original game that gives you a feel for this game's humor and meta-commentary. However, if you want a more direct demo, there's the original Half-Life 2 mod that this game was based on.
To answer the main question though, you really only "need" to play the original if you care about a very specific easter egg ending that requires a console command to access, and really, really feel the need to experience one of the endings with Minecraft and Portal being referenced instead of two different games.
As others have said, everything else is intact here, in addition to new content (some of which is entirely new, and some of which riffs on the existing content once you unlock it, and is - imo - pretty funny.)
1) Licenses likely only applied to the original release, not remakes/ultra-deluxing. Now that Minecraft is no longer an "indie darling" and owned by a certain ginormous company, it would probably be far more of a pain/$$$ to include over Firewatch
2) SPUD is made in Unity; TSP is made in Source. Because Portal was also Source, it was likely easy to include (and Minecraft not hard to recreate, I assume). Firewatch is made with Unity, likely making for easy import, though Rocket League is Unreal Engine (but, again, just have to import the map and do some physics stuff that Unity probably has built-in)
In any case, it's not like Valve is doing anything with it except tech demos so I doubt they'd make including Portal in SPUD difficult. I think that replacement was because, due to property languish, the replacement is much more recognizable than the original riff.