The text transcription feature does. But the AutoML documentation doesn't list TIFF as a supported file type. Is that documentation outdated?
You mentioned two different products, the first link you shared is from Cloud Vision API which are pre-trained models and indeed supports TIFF files as is mentioned in the Support Images page. And the second link you mentioned belongs to AutoML Vision where you can train your own models and doesn't support TIFF files, the difference between products is mentioned in the "NOTE" section.