One from left field...
Focii have a similar "turbo wind down" sound from the electro-hydraulic steering when the ignition is switched off (or so I'm told that's what it is - happens in petrol as well as turbo diesel models anyway, so it definitely isn't turbo related at all). Might it be something related to the steering?
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His: 2019 Ford Focus SA Trend with Driver Assist Pack: 1.5 Ecoboost 3-cylinder (yes, 3 cylinders!), 8-speed automatic in Ruby Red. 
Hers: 2020 Ford Puma JK: 1.0 Ecoboost 3-cylinder, 7-speed DCT in Frozen White.
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