[Brightcolours]

The point here is not: do the images look natural or fake (I like them, btw). It is simply a matter of personal taste how much pulling of shadows (or highlights) one still finds attractive or considers HDR overkill. There is no right or wrong.

The point is: does the camera's sensor provide enough information to offer some buffer for this kind of post processing or not.

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for those shots I can easily have the same result using RP, however I would  have exposed a little more to the right without burning out highlights to avoid noise in shadow areas.
shooting to the right then decreasing exposure to taste is always a valid approach

As you can see in the lower shot, there is already some clipping in the bright spots of the clouds. So, moving exposure further to the right probably would have caused trouble.

Yes, and the RP sensor does have that buffer. The standard tonal curve will be around 7.5 stops.

Not all cameras have the same headroom (in the light part), Canon tends to have quite some headroom there (probably that will not be the same for all models). I do not know of anyone testing the differences in headroom, but with some cameras you can expose a little bit more successfully to the right than with others, depends on the chosen tonal curve the exposure is based on.

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Well, having seen that place myself I do not think the image looks fake You may argue if the color tone of the sky is a tad too much or not, but then this is definitely also true for the first two samples you posted

The 2nd image actually shows the warm colours that were there just before sunset, the only thing I did was limiting the DR (pulling the blackpoint up a bit). I was trying out my then newly acquired Nikkor-S*C 55mm f1.2. Taken with "daylight" WB. 
The 1st image, you are right. I posted it to show that limiting DR is an actual thing in photography.