Have you got a link to this article because I'd be interested to see how they've calculated this. As of the last full set of accounts (17/18), less than half of PL clubs made £25m total from commercial revenue and several not even making £15m, with shirt sponsors and kit manufacturing deals making up the majority of commercial revenue for all but the top 6 sides. For example, Burnley's total commercial revenue was £9m with their shirt sponsorship deal, reportedly, being worth around £7m. That would mean the total value of all other sponsors, their kit manufacturing deal, retail and advertising is just £2m per season.
And I'm not saying Newcastle will or won't spend fortunes. I was just explaining the FFP limits, how transfers are accounted for and what Newcastle might be able to spend.