Though, I don't see true sideloading (like on Android) specified. If apps still need Apple's approval, we will get "freedom" who to pay, not what to run. I still don't see device liberation within the scope of the DMA.
However, if we're lucky, Apple may decide the app approval process may not be worth it, if they are not allowed to extort developers anymore, so they may allow unsupervised sideloading as a consequence.
In any case, requirements and reality may take much longer to align than 6 more months, considering Apple's cringeworthy tantrums so far...