Gravity is weak in 3D, but it may be stronger in 4D or more

Fermilab’s Dr. Don Lincoln shows us that gravity is way weaker than magnetism and that gravity itself may manifest fully in a $D or more dimensional space.

Since gravity is actually space-time bent in the presence of matter meaning that it isn’t actually a force per-se, much like centrifugal force is not a real force, I am having a hard time understanding why extra dimensions would help in explaining that gravity is, in fact, stronger than we see.

Would that mean that in 4D the space-time bents even more? Also, since gravity is the curvature of space-time, why would we need a graviton? I’n dense, it seems.

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