The article mentions a 5% surface area increase potentially offering benefits, but that's A LOT and if the suits had been altered in that way, surely someone would have noticed?
Also someone took a "secret" video of the suits being altered?
I'm sorry, but this doesn't pass my smell test. I don't doubt the suits having been alerted, but I highly doubt this having been done or ordered by the athletes who used those suits. And neither any of the team members, acting in favor of these athletes.
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Winning gold is nice, leaving an auditable trail behind, almost certainly causing them to be stripped of their achievements, career, reputation, livelihood and opportunity to pursue their hobbies for an uncertain minimal gain, isn't.