This is a financial report. Not a brag sheet. If they have spent a significant amount of money on something, they have to account for it.You can say that they did not mention spending money on the Froome case in the 2018 report, but I think it's quite a leap of faith to say they spent nothing on it. From memory they were involved in the case and so, clearly, they allocated some resources to it. I'm not sure I would expect them to brag about betting on a losing hand. The absence of evidence is not evidence of absence.
It was pretty clear even in 2018 that WADA easily let go of Froome’s doping case.