He was only pointing out he thought they had been dishonest not that their supplement isn't good.Have a read of this, explains joint supplements very well: https://askanimalweb.com/equine-joint-supplements/
And here he talks about Feedmark:https://askanimalweb.com/the-truth-behind-joint-supplement-comparison-charts/
He’s not a massive fan of Feedmark to be honest!!! Science supplements are very good and do have research behind them x