Anybody engaging in semantic sophistry about "suspicions" is wasting their time. The answer is hiding in plain sight, in the use of the word "settlement" in the initial announcement. The word "settlement" would not be used if the FIA had investigated Ferrari and found no evidence to support claims that they were abusing or violating the technical regulations.
If the FIA had exonerated Ferrari, the statement would have said that. In fact, Ferrari would have insisted on that wording being used. Any other wording, as is the case here, would have led to continuing suspicion that Ferrari had in some way violated, or attempted to violate, the rules and regulations.
The word "settlement", in legal documentation, means that evidence or events led to a legal or commercial disagreement between parties, and actions were taken on both sides to terminate the disagreement.