We shouldn't see this from the Pakistani lens but the American. Looking through the American lens it is clear to me what they are doing.
Firstly, it has nothing to do with Biden personally. The Americans have a pretty robust establishment too and Biden is an establishment guy. So whatever policy we are seeing is a well-debated policy that is not going to change by tiny actions.
The policy being make India the sherriff of Asia:
1. Downgrade all ties with Pakistan and force Pakistan to deal with India directly, and not expect any mediation or anything from the US. Pakistan has demands? Send them through India. Yes, that's what I think the policy is.
2. Build up India against China - this is the obvious part.
I believe the intent is to force us to choose a side in the US China spat. US will not accept a neutral Pakistan and it's the old "you're either with us or against us" policy.
The reason they can be so blunt with Pakistan is that they have very little interest in Pakistan anymore. They can very easily do nothing in Afghanistan, let shit hit the fan, and blame Pakistan. Win win for them.
Unfortunately, we are in a precarious situation trying to stay relevant to the US so that it doesn't make India the unopposed sherriff. What we will offer is anybody's guess.
Option 1: Pakistan joins China camp. India is America's sherriff. Everything in Afghanistan is blamed on Pakistan.
Option 2: Pakistan attempts to stay neutral by offering USA a base or two in secret. In return USA still talks to us directly. But we will still get blamed for Afghanistan because the bases are secret (because of obvious public pressure).
Optipn 3: Pakistan joins the US camp and openly gives bases to the US. This will be a post-911-lite. Will keep us relevant to the US but there will be serious internal political consequences.
As it is always with Pakistan, there are no great options, just less bad ones.