Can Ibn Taymiyyah's opinion be adopted regarding the validity of a marriage if the husband is content with it, despite his not having explicitly verbalized empowering the representative?

Since you have appointed your uncle to accept your marriage, the contract is valid and there is no need to renew it. The contract is not invalidated by your not uttering the代理 at the time of the contract, because the agency is valid with any words that indicate it. If we assume that your uncle married you without your authorization and you consented to it, the contract is valid according to some scholars. And acting upon the opinion of some scholars in validating the marriage after a long period is permissible.