Update 2: AntPool included their first P2TR spend (mempool.space/tx/cf0cfea65b9…) in block 710494. All pools that mined ten or more blocks since taproot activation have included at least one P2TR spend.
Update: F2Pool included their first P2TR spend (mempool.space/tx/414ef7844f2…) today in block 710269. F2Pool reached out, and we debugged the issue: Nodes are up-to-date but didn't have any >=v0.21.1 peers (due to custom patches and addnode) that relayed P2TR spends. That's fixed now.
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Nov 20, 2021 · 11:59 AM UTC

I'm not too familiar with AntPool's situation. It seems like they had upgraded their nodes for activation. Some other factor (unknown to me) was hindering P2TR spends from being included in their block templates. Maybe too old peers too? Maybe @bitentrepreneur knows more facts?