Hainer was impressed with how Tuchel set up the team tactically to nullify Arsenal in the 1-0 second leg and 3-2 aggregate win.
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Post-game, Hainer said: "I think Thomas Tuchel did an excellent job. A tactical masterpiece.
"The fact that he played with Nous Mazraoui and Guerreiro was a perfect fit."
Director of Sport Max Eberl added: "Simply done cleverly. Serge was out, Phonzy (Davies) was suspended.
"They discussed it very cleverly with the coaching staff how they wanted to do it."