There most certainly is a course creator. Albeit your stuck with the textures they give you in-game.
Of course you are absolutely correct, there indeed is a CA for this sim. My fault for assuming that there probably would not be one. I went through the whole tutorial on using it and it appears to be fairly easy for even novice designers to use and obtain acceptable result. However, as you pointed out, you are stuck with the textures that are included in this particular architect. Adequate for mainstream designers I guess but for more experienced creators, these textutes in a lot of ways would not cut the mustard.Although the vegetation featured in the 2k21 CA is acceptable, it can certainly not be described as extraordinary. Custom course design in this sim will take on a repetative look in a short period of time. An example of a terrible tree stock texture that is used to this very day in custom courses for the TW08 platform was actually introduced by EA Sports I believe in 07. Anybody that has played TW08 would be familiar with this tree. It is a light barked abortion that looks like holes were drilled into the trunk and the limbs were pushed into existing holes. If you play courses and there are many, and you apply any wind conditions but Calm, the limbs of these trees will seperate themselves fom the trunk. Why anybody would use this piece of crap in their otherwise great design is puzzeling to me. This is an extreme example to be sure. It is just to make the point that no matter how well a rendition is laid out, if the overall look is not portrayed in a realistic maner, it is only just ordinary.