Well. Just noticed, but apparently, LMs' own opinion on F-35 stealth isn't exactly high
I don't think that's an appropriate conclusion from this.
Even a mig-21 can be stealthy enough if the situational awareness and environment allows and/or can also be exploited.
A proper stealth fighter like f-35 is always damn deadly and needs to be treated with respect even for first tier militaries.
Under ideal conditions and environments, maybe a traditional fighter is spotted and engaged/effectively countered. There are plenty of instances where radars available on the ground or in the air simply cannot even spot something small like a gripen, especially if EW is thrown into the eqn.
It could be terrain, jamming, direction of approach even, you can't always cover all angles and airspaces all the time. If it's no certainty in spotting fourth gens every time, a fifth gen stealth is always advantageous.
Perhaps the visual is accounting for future AD or some margin of safety and risk that places f-35 far outside of anticipated threats. It could simply be a promotional effort to illustrate the improved vlo of ngad.
After all it seems pretty much accepted that 6th gens are going to up the stealthiness by some order of magnitude. Both US and China.