Committing forces to someone elses operation is risky, especially if you don't have contact with whoever is already on site. In the Shadowrun world there is a real risk that the force attacking the platform is not ideologically allied and is in fact one of MCT's competitors, or even MTC itself trying to manufacture an excuse to strike ecoterrorist assets.
If you want them involved however involve them. They don't have to be perfectly paranoid, or unwilling to exploit the situation, maybe sending another spirit ahead to make contact. They could even have had their own op already past the go point, storming the platform from the sea faster than the HTR could have got there, then bring in the HTR via the air to make things more interesting.