The talk is available via peertube (ironically a federated service) and YouTube.
I've seen the talk but not read his blog post and the arguments brought in the talk are even more ridiculous.
He discontinued p2p video/voice because clients could discover each others IPs. (A fact that is only sometimes true and can be mitigated by the use of additional services) but still defends the use of phone numbers as identifiers to share with everyone you want to talk to.
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