If you're reducing costs by eliminating needless expenses, that is a good thing.
If you're reducing costs by eliminating player salaries, that is bad (assuming they are not out of control, which they are not relative to the rest of the league). You're effectively reducing your asset base (players), which are the assets that generate your cash flows.
They can't possibly reduce the squad further and intend to compete in the PL. If they do release top earners, those players will need to be replaced, likely with similar salaries. Not only that, the squad needs more numbers so we're not talking about trading just expensive players for cheaper ones. There is a need for additions to the numbers we already have.