UPDATE:
1st mechanic appt they confirmed the axle bearings need to be replaced via the excess wheel movement. $75 cdn
2nd mechanic appt they replaced the axle bearings. $560 cdn (parts+labour, i supplied the oil and additive $100)
I'm still getting an intermittent grinding on the rear passenger side, when making left turns (at about 30-40km/h) If going faster, the intermittent grinding is increased.
I called the mechanic back, he indicated to drive it for a week so the fluid circulates and if needed book another appt.
I jacked up the rear, the wheel is definitely tighter, there's no more play at 12 and 6 and I can easily spin the tire whereas previously it was difficult to spin. However there is still movement if you pull the wheel directly outward and inward. Just like the above video from July 15.
Really need some advice for the remaining grinding sound around turns.