Can someone give mechanism of reaction of pcl3 and pcl5 with alcohol?

I have searched on YouTube and the video by atp mentions that the reaction is Sn2 but at my coaching we were told it is sn2th, which is right among them?

Mostly Sn2th term is not used rather only Sn2 is used because Sn2th is just a Sn2 reaction in which the intermediate is tetrahedral
So precisely it is Sn2th reaction but calling it a Sn2 reaction is also correct because all Sn2th and Sn2 Ar reactions are basically subsets of Sn2 reactions

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