Not deals, "commitments".
Was anything actually signed?
MS doesn't to sign anything to publish games wherever they want unless MS asked PS, Nintendo and Steam in these 'deals' something in exchange to publish CoD there.
Like any other publisher they can submit any game they want and as happens with any big publisher they will be published.
It's more like a promise of a politician, a claim not needed and that doesn't require to sign anything to 'prove their commitment', but I assume it's made to try to get more chances of getting the acquisition allowed by the regulators.
In fact, the regulators didn't requested it and to claim something in Twitter doesn't mean that they'll maket it happen, MS could change their mind tomorrow and nothing would happen.
Probably is a PR stunt to justify on front of their fans that CoD won't be console exclusive using a false 'regulators forced us to make concessions (when no regulator asked for them, at least until now)' claim as excuse.
Let's hope that at least the few regulators which are not corrupt out there are also smarter than this.
At least one of the regulators already highlighted that MS claiming that they'd keep releasing CoD on PS didn't mean a shit because they said the same about Bethesda before, but later Starfield and Redfall were -at least until now- announced as console exclusive.
So at least one of the regulators will ignore this claim. And well, as Valve mentioned MS doesn't need to make such commitment, they (and any other platform holder) will publish on their store any game submitted by MS without needing any commitment or signed deal.