A 25V cap may survive slightly more... that and the lower capacitance suggests this might be an attempt at planned obolescence by extreme cost-cutting, only limited to those regions where they know their customers are more willing to be screwed over or have shorter warranties
1800/25V is the cheapest option, followed by 2200/35, and then 2200/50. An examination of warranty policies in those regions may reveal a correlation. Since a 25V cap won't suddenly explode when given 25.1V or even 28V, someone may have initially calculated that they would be "good enough" to make the product last just beyond the warranty, but then due to other factors (maybe failing a bit too soon) they stopped doing it, which is why your specimen is different.
This isn't the only case of something like this happening:
https://www.eevblog.com/forum/repair/philips-uses-part-exceeding-max-rating/
Still, not what I would expect from Sony!
It could just be a typo, too.
Not in the same class, but many years ago, I bought a nice cheap, AM CB radio from K-Mart.
For a "cheapie" it really looked good-----nice big "S meter", attractive chrome panel, & so on.
It received well, too, the only drawback was that I couldn't seem to talk to anyone!
I took it to work, had a look at the output with an Oscilloscope, & found it was only capable of about 1-2% modulation.
Comparing the real thing with the schematic included in the operator's manual, (imagine, a schematic in a
K-Mart product!), I found that a coupling capacitor actually fitted to the microphone amplifier was 0.0047 uF, but was shown as 0.47uF on the schematic, which was a much more logical value.
Fitting the correct value cap restored the modulation to normal.
Looking at the Parts List (OK, BOM if you insist), I found the incorrect value cap listed.
Fairly obviously the assemblers diligently followed the Parts list---- I wonder how many disappointed CB-ers "gave up on the whole idea" from such a radio.
Re the other thread:-Philips
have been guilty of some dumb things in the past-- much more so than Sony, but the 40" flatscreen referred to in that thread is probably a "badge engineered" Chinese cheapie!