The "and Surface" there is likely more hand waving than substance. ( or pretty similar to SQ2 , SQ1 being independent products. )
That's for server ARM chips. That project is being run out of the Azure Business group.
The competition is Amazon Graviton 2. ( the
upcoming Ampere Altra CPU rolling out to large cloud competitors. and with
semi-custom Thunder X3 coming. )
Everyone who is a large player is in the cloud services space is probably going to have a substantive chunk of ARM based servers in their datacenter in 3 years. This is primary Microsoft just "keeping up with the Joneses".
Maybe something will fall out later for the Surface, but the primary design goals are likely to be substantively different.
More likely Microsoft will get some other vendor(s) to lay some better foundation here. Whether Qualcomm puts more resources behind their effort or Samsung cleans up their act or someone else comes up with a PC laptop focused solution. Strategically for Windows it would be far better if they fostered some generally available solutions so that their Windows "partners" could weave them into solutions also. Microsoft building a laptop chip that you have to buy to run Windows 10 on ARM would be bad long term strategically. That isn't the business they have. Microsoft far more so needs to 'boot strap' a more general solution. That would best be done by working on a couple of solutions with partners. The major problem so far is that only working with Qualcomm. ( who is just as much as interested (if not more ) in selling cellular radios are a mid-range PC SoC. )
If Qualcomm and Samsung just did larger variations on their top end smartphones with four Cortex-X1 cores ( instead of the one X1 in the Snapdragon 888) there would be something competitive enough for Windows 10. wouldn't be faster than M1 , but if Windows ran natively that would be a large upside to those firmly committed to Windows 10.
The real large gap that Microsoft is missing with Windows on ARM is not Surface. It is desktops and workstations. (and/or large , heavier "desktop replacement" laptop. ) . They could try to 'stop gap' that hole by stuffing some server packages into a box with slots, but that kind of missing the point. They are going to need a developer ecosystem to drive the growth on ARM servers. Doing that on lightest of light , max battery life laptops isn't the more productive path forward.