Daily Mail isn't journalism. They're complete trash. Trust them like you would a used car sales in man in a cheap suit.

I’m taking that one with a grain of salt; it’s coming from the mouth of one ceo, with little to no apparent fact-checking, through a paper that has been widely criticized for sensationalism and unreliability in its reporting.

source: https://en.m.wikipedia.org/wiki/Daily_Mail

You can't take the company at their word on that. They're in the middle of a labour action, of course they're not going to go on about how much effect the strike is having on them, that's counter to the goals of starving the other side out.

And anyways, this is saving money in the sense that burning down one's house will save money on rent.

If people aren't doing work you aren't paying them wages. So yes, sure, some company probably saved 100m in wages, benefits, etc. This is what they call bottom line savings. What i'd like to hear is how this affects their top line e.g. revenue. Only the combination matters and odds are this will have impacts on the top line in the next 18-36 months.