Your technical readers will gloss over the example. If you use this try to use fixed pitch for the large numbers.
The technical term is computationally infeasible. But as an example consider the two numbers:
The first is 7.5x1018, the second number is somewhat less than 264.
The first number is a ...
Technically speaking, a side-channel attack by definition doesn't attack a KDF but a specific implementation of it. An example of an implementation would be the way macOS turns a user's password to a disk encryption key with PKDF2. A gZip application may execute the PKDF2 in a slightly different fashion.
The answer to your question is yes, because you can ...