That press release is a response to Bitcoin Unlimited, a failed hard fork attempt and not for Segwit, which is a soft fork. Though their stance is probably the same.
"hard fork and soft fork" - dont have realy any difference, with hard forck old client reject frock`s blockchain immediately, with soft frock old client reject forck`s blockchain after spent from new style transactions (about 5 blocks)
it the same
Bitcoin holders will get both, original and fork(hard or soft). Community will select wat is better. Bitcoin holders will win anyway.
https://poloniex.com/press-releases/2017.03.17-Hard-Fork/