That's not wrong, but it's roughly equivalent to saying a 10x engineer can help by unblocking other engineers on their team.
The devil is in the details. Does the 10x engineer accomplish that by pairing, code reviews, architectural leadership, refactoring, mentorship, improving team tooling and build processes, or just doing all the work themselves? The answe is any and potentially all of the above, as whatever the situation dictates. The 10x engineer is seen as 10x because they have a good sense of situational awareness and capacity to adapt both strategically and tactically as needed, which compounds itself to become an incredible source of productivity.
The same is true for a 2x manager shielding the team from corporate bullshit and clearing obstacles. Those are end goals, but there are countless paths to take to get to those goals, not all of which will lead you there. A 2x manager is able to suss out the fine line required to balance team needs against organizational forces in such a way that they'll have the policital capital[1] required to be a good steward/advocate of their team while also having their team seen as a productive asset of the company in order to accrue that political capital. Something which is ridiculously more difficult than it needs to be, if you're attempting to do so in a way that's sustainable continuously and not just a short term play that'll rebound later on.