But it appears to have been disabled now. In the thread you shared, meghan (who appears to be part of the Moz team) linked this as the answer. Source: almost 3 years ago

Threads is one the new immerging social media site that is owned and operated by Meta and introduced by a famous platform known as Instagram. This is basically a text-based conversation application in which people can share their thoughts throughout communities in text-based system known as threads. It helps you to interact with your friends in a all new way. It also helps you to share your thoughts on any topic... Source: 11 months ago

That is a MAJOR drawback. Maybe it will come with time. But the domain is threads.net. threads.com belongs to a completely different app. That is going to be a head-scratcher for sure. Source: 11 months ago

If there is anyone to feel bad for in this situation it's the folks that own threads.com and have been working on their Slack / Discord alternative whatever. Source: 11 months ago

There is an app called Threads, described as a 'slack repacement designed for makers', which owns https://threads.com . They have had to put a big badge saying 'We are not associated with Instagram' on their home page, but.. I bet they're getting a lot of unexpected new business this week. Source: 11 months ago

So where is the webclient? Apparantly not on threads.com, which would make sense. Source: 11 months ago