I am not sure which argumentative straws you are grasping at: claiming that Trump is so ignorant or unaware of the fact that a key witness is testifying at the exact moment he's tweeting? Or, that he is so stupid to think that if omits the word "testimony" he's free and clear?
Moreover, Ms. Yovanovitch has an exemplary record and was asked by the State Dept to stay another year in Kiev -- right before Trump sent her packing.
From where I sit, you and your Trump devotees are an accessory to the coverup. Trump wasn't interested in Ukrainian corruption. He was interested in corrupting the Ukraine and when Yovanovitch wouldn't play along, he removed her. Yovanovitch described how, as she sought to promote democracy and rule of law in Ukraine, the president’s lawyer, Rudolph Giuliani, worked with a corrupt Ukrainian prosecutor to trash her reputation and force her out of her post. That narrative is confirmed by all other witnesses, especially David Holmes, an official in the American Embassy in Kiev, who testified that he had overheard a telephone conversation in which ambassador Sondland assured Trump that his Ukrainian counterpart “loves your ass” and will do “anything you ask him to,” including to open investigations into the family of Mr. Trump’s leading Democratic rival, Joe Biden.