A rattle when you let off throttle is generally rod bearings. A main bearing normally is a low pitched thump, especially at startup before oil pressure builds. How fast oil pressure bleeds off after shutdown is a good indication of bearing condition, but it (naturally) requires an oil pressure gauge.
I'm not hearing any of those sounds in the video. Possibly you are hearing the rocker arms going from side to side? There is a mod to put a thrust bearing on the rocker arm shaft to stop that.
I'm still having a problem being concerned about what I'm hearing. Maybe I need better hearing aids?
FWIW, I chased a noise in a Strada for months. Tore it down twice, balanced the entire rotating assembly. Eventually found it was a crash bar doing it.