VSMPS for the STM32H7 (main MCU). This is the nominally 1.8V output of the MCU's integrated DC-DC converter which is then LDO'd down to run the various internal power domains with dynamic voltage scaling.
1.801V so right where it should be. Ripple is 12.00 mV p-p, 0.70 mV RMS, so no cause for concern. This is clean enough I don't think it's the source of the junk on 3V3.
Even far more dirty power would be fine here seeing as this rail is LDO'd before use. So no need to revisit it.