Care to elaborate or are you just here for the snarky comment
Okay let me actually elaborate a little further (trying to beat the snarky comment allegations right here):
Without even going into any technical discussion, let's just apply Occam's razor for a second.
How likely is it that this person. who nobody really knows and who has no prior history in the scene managed to
- find a vulnerability
- exploit to to gain code execution with enough privilleges to dump the UFS
- develop an FTP client without any public SDK being available
apparently all on their own? All of this while actual security experts who have been very active in the scene for years have continued to state how secure the system is. I don't think this is very likely at all.
From a technical standpoint there's the clues I've already given in my first post in this thread.
The person also seems to imply that putting "it into RCM mode" in and of itself is already an exploit.
It isn't and people need to realize that just entering RCM isn't some sort of holy grail*. I work in the security field and I deal with a lot of embedded systems, the overall majority of which have some sort of recovery mode for field return analysis and for debugging during the development lifecycle. I guarantee that the Switch 2 has one too and it will likely work very similiarly to the one in the original Switch, albeit without the same vulnerabiliies. I don't think it is likely that this person has found a way to enter RCM just by messing with the USB ports, but I'm not ruling it out completely.
*
Exploits in these recovery modes are of course extremely valuable for attackers because they give you very low-level access to the system often bypassing any and all security measures. These interfaces are usually also deeply embedded into the processors meaning any vulnerabilities are likely not patchable by the vendor (Nintendo in this case) and require a patch from the manufacturer of the chip (Nvidia). But again, exploits in these interfaces are the holy grail, not the interface themselves.