Is the concept of provably secure hash the same as entropy smoothing hash functions?
Ricky already gave the answer, but here are some additional details.

"Entropy smoothing" hash functions are randomness extractors. Extractors are functions that extract almost uniform bits from weak sources of entropy. In a way, they spread the min-entropy of the input source almost evenly over the (shorter) extracted source, hence the smoothing.

The Leftover Hash Lemma asserts that a strong randomness extractor can be constructed using a family of pairwise independent hash functions. So, if $\mathcal{H}$ in your statement were such a family, you get $(k, H_k(\delta)) \approx (k, h)$.