I’m no pro at editing, but I had a quick search for ways of digitally removing text from video.
Have you considered the ‘Content Aware Fill’ feature from the 2019 update of Adobe After Effects? I watched a tutorial here: https://www.youtube.com/watch?v=TvWI0a0Oqi0 and thought it could potentially help for this.

Some more generic and less clear instructions (and they advertise their own product) can be found here: https://filme.imyfone.com/watermark/how-to-remove-watermark-from-video-in-after-effects/.