To me it makes sense that the Omnicrons and thus Omega wouldn't know or if they did not use Dynamis. As it's not an efficient tool. They started out as a very weak organic race that sought out ways to make them stronger than their opponents. This led them to slowly turning into what we see in Ultima Thule. Where we get Sir who when asked if they have an idea for a weed killer tells the Killian to just burn the entire crop area the weeds are in. Why? Because it's the most efficient way to get rid of the weeds. It's why that by the time they came across the Dragon Star they had come up with the plan of total destruction of a planet's natural resources. All because it's the fastest and most efficient way to demoralize your enemy. So even if Dynamis can help you be stronger needing to rely on an energy source that is so far only usable via emotions isn't going to be very effective. That and emotions by the time the Omnicrons became the machines we know them as now they dumped that part of them.
Dynamis might feel like midi-chlorians and yet the game even if there wasn't a name for it at the time or the devs even having a solid idea about it has been hinted at for some time. We have been asked on many an occasion by our foes how are we able to be so powerful? To the point where Omega got so mad at us messing up their math calculations that they slapped us into a goal and started to crush us inside said goal in hopes that we'd somehow just show him and the others the hidden power we tend to tap into. Only for Midgardsormr to bust in and free us while basically saying "how about we don't go and do that and just agree that they're capable of doing so? Cause it's not time for that." before taking a bow and telling us he's going for his 200 year nap. Sure it's a retroactive retcon of the lore as now we can point and say oh look they've hinted at this for awhile.