It doesn’t look right, it looks like the boiler might be overfilled. You could try draining some water out of the boiler and then allowing it to refill, it looks like the boiler might be overfilled. When it stops, switch off the machine, allow it to cool down and then reheat and see if the vacuum breaker spits.
If it doesn’t spit like that, then you could try disassembling the AUOFILL solenoid valve and descale plus clean it.
If the auto fill solenoid leaks, every time you make a shot, some Water can be entering the service boiler
