They can be but their profiles don't look like alt accounts. @BlokchainB signed up a lot earlier than @frostdragon for example. They also seem to post at different times. @frostdragon was even gone for a while.[^1]

It's good to be vigilant in this stuff ("sat farmers") as @siggy47 mentioned [here](https://stacker.news/items/452477) but I don't think it applies here.

[^1]: Or at least they put in a ton of effort to maintain two alt accounts that look different. It's hard to proof this stuff without ID verification but we certainly don't want to go there

Are you sure? Can’t he/she be the same person with two different accounts? 🤔

You're wrong. The OPs from both posts you refer to are different people.