There is nothing particularly noteworthy about a platform lasting for several years after its successor launches before getting discontinued.
I recall that Furukawa talked about how Switch was entering the "middle of its lifecycle" back in late 2020/early 2021. Given that the Switch successor doesn't look to be launching until early 2024 at the absolute earliest, it seems pretty samn clear he was referring Swutch having a long lifespan as Nintendo's flagship game system.
OK, again, undefined terms. How long is that "middle" intended to last? Are the 3 stages measured in an equal number of years? If not, what's the expected distribution?
Also, if they are measuring based on when the successor hardware comes out and it's 2024... that's 7-7.5 years, depending on when in 2024 it releases (if they don't do something bonkers and have it for this holiday). That's not really all that "longer than usual", unless around an extra 6 months to a year is enough to be considered "longer than usual". I ran the numbers on this in another thread:
Excluding the GBC, GBA and Wii U (the shortest hardware cycles Nintendo has ever had, removed in the interest of fairness), the average time from hardware launch to the release of the next hardware is 6.395 years.
For just consoles except Wii U, the average is 5.87 years, less if Wii U is included.
For just handhelds except GBC/GBA, average is 7.26 years; OG Game Boy's obscene timeframe and removing GBC/GBA skews that figure immensely, so looking at just the two most recent handhelds, DS and 3DS, the average is 6.145 years.
Looking at the median averages for recent successful Nintendo hardware (and most of their hardware overall) before new hardware releases, it's not that wide of a gap. For this to be genuinely "longer than usual", we'd have to wait until 2025 or later to see a release.
This is what leads me to believe that Nintendo has some intention or another to support Switch with software for "longer than usual" and the commentary has nothing to do with hardware, as they have not supported a hardware platform with new software releases past year 8 since the Game Boy (and even that needed a cultural phenomenon like Pokemon to get software support at a regular pace again after it began to stall out in the year before Pokemon's release).
But while that's my interpretation with the data to somewhat back it up, it's just that, because.... I'll say it til I'm blue in the face... we don't know what the definition of these phrases actually
are. And because they're not defined, people can insert whatever meaning they want them to have into them, which makes them practically useless to use as some sort of hard fact as you're trying to.