I watched this last night. I couldn't believe that all that holds the blade is a cheap plastic fan, and that a couple little plastic "nubbins" are all that keep the blade from spinning on the fan. It's the most toy-like design I've ever seen. If you read through the comments, the part number is identified through the original manufacturer (Greenworks), but, of coarse, it's out of stock.
Err did you watch it properly ?
There is a bolt that holds the blade on
The plastic pips are there as a shear pin and are necessary because if you have the motor under full power and the armature stops working then you will burn out the coils in a few seconds if the thermal cut out fails
Then the batteries can overheat & self ignite as they require a cooling air flow to dissipate the heat generated when they are discharging a high current load
So they go to great efforts at the lowest cost to avoid that happening .
Judging from the accent of the customer service operator I would speculate she was in the Phillipines in a call centre that handles "customer service " for dozens if not hundreds of different brands & types of items .
She obviously dd not have an IPL of the mower in front of her or she would have known what the proper name of the fan was.
In the 45 second gaps she probably answered 2 more calls while the computer was doing an inventory search of what parts they had in stock for that mower .
Call centre staff have to answer X calls per hour or they get fined for taking too long on calls >
"please hang on while I consult my supervisor "
is call centre speak for
"I just have to take a couple more calls or I will be under quota for this time period "
If they are only doing a small number of brands they will have a set of cards that they read from
If they are doing massive number of brands then they will have multiple screens.
What you do in these cases is write a big sign that says "this $ 600 mower is trash because you can not buy this $ 5 part
And early Saturday morning you and the mower set up near the front door.
Within minutes if you are white you will be loading the new mower into your vehicle
If you are black then you will be beaten & dragged off to jail for more beatings .