The accounts and posts you have linked are definitely spam.
The problem is deciding whether to sanction trade.io or its bounty participants. I took a look at their bounty thread (
https://bitcointalk.org/index.php?topic=2370663.0) and it seems like they offered no such paid services for shilling.
Just my speculation, but most likely trade.io is dealing under the table with people(person) who has/have access to multiple shill accounts.