I definitely think you're correct. In the future you could probably save yourself the hassle of the "Are you a lawyer?" questions by dropping the phrase "almost

I definitely think you're correct. In the future you could probably save yourself the hassle of the "Are you a lawyer?" questions by dropping the phrase "almost certainly" right before "not a valid contract". Most attorneys I know are super reluctant to call a contract invalid without some sort of qualifying language. This contract might actually be egregious enough to warrant an unqualified declaration of invalidity, in which case you should go the other direction and overstate your case with conclusory statement and some word like "clearly" or "patently". "This contract is patently invalid!" and then explain why.