These numbers are meaningless. Approval could be 5% and you wouldn't know, amd average russian wouldn't know.
Its difficult for a western mindset to understand the mentality.
In Russia no-one trusts that a rating agency is independant or real or has nothing to do with the government.
They will always reply that they support any official policy, even if the policy is anal probing.
Many have gone to jail for 15 years for voicing dissent. Prisons with widespread torture
https://www.reuters.com/world/europe/russia-introduce-jail-t...
I am hoping that mobilisation will cause some sort of social unrest. You don't know what everyone else is thinking, it's like the opposite of manufacturing concent
This is not cannon fodder. Russia is running out of willing soldiers, not soldiers in general.
Calling for mobilization now gives them a few months to train and get equipped when winter brings fighting to a close. It'd be interesting to see where Russia finds officers for these new troops. Or maybe training/equipment/officers don't matter, if the plan is to use them as cannon fodder.
Regardless, Ukraine will find it harder to make progress next year like they've done in the last few weeks. There won't be any fronts that are thinly manned and easy to punch through like Kharkiv was.