That's right, I'm curious because whatever the reason is (cost, availability), they use different XMOS chips and oscillators with every revision, but in every other D30 board I've seen crystal oscillators are used, and the only one that's using silicon based ones is the 10.1, but they seem to be unidentifiable, be it intentional or not (some manufacturers offer that service on request, removing references from components). Anyway unless they are really poor it shouldn't be a problem, there are applications where phase jitter is far more critical than in audio (high speed/bandwith ones), contrary to many people beliefs.
Regarding the board I have exactly the same as the one you measured but with Capxon electrolytics, that I understand are just output caps for the voltage regulators, so if the values are as printed there shouldn't be any problem since they seem to be already over-specced.
Anyway the D30 is a pretty weird design by itself nowadays, since they could have used a more recent (non flagship) DAC chip with 384/768 kHz and higher DSD modes without increasing the price, although the same can be said for far more expensive gear (many Marantz products use CS4398, even their DAC1).
Regarding the board I have exactly the same as the one you measured but with Capxon electrolytics, that I understand are just output caps for the voltage regulators, so if the values are as printed there shouldn't be any problem since they seem to be already over-specced.
Anyway the D30 is a pretty weird design by itself nowadays, since they could have used a more recent (non flagship) DAC chip with 384/768 kHz and higher DSD modes without increasing the price, although the same can be said for far more expensive gear (many Marantz products use CS4398, even their DAC1).