Word count in Google Slides

I recently tried to export my Google Presentation as a PowerPoint file and after that opening it with Keynote (since I am a Mac user). All the speaker's notes were captured appropriately without much loss of detail. But when opened with PowerPoint on my Mac the formatting all changed.

I only have experience with text documents from Google Docs, but their accessibility appears abismal, and I must assume the same holds true for presentations. The only way I've been able to get a screen reader to read such a document is with the ctrl + alt + z keystroke (there is supposedly more information on shortcut keys available with ctrl + alt + /, but this does nothing for me). If the document takes too long to read, though, my screensaver comes up, and I can't just start reading from where I left off.

Whenever there's something on Google Docs that I want to read, I save the page and read it as source code. This is a cluttered mess, but it works better than trying to read it on the internet. I have no idea how this would apply to presentations.

If I am mistaken, I would love to be corrected; there are things I wouldn't mind reading that I just haven't felt were worth downloading and navigating as source code.