That's very likely. But I don't want Excel to be launched.
My first attempt to remove 5 lines from sharedStrings.xml and adjust sheet1.xml has failed. Perhaps I made an error, perhaps there are other files that need a change. Will try to figure it out.
I don't think you're going to get there by hacking the file contents in that way. Try ssconvert (I think that's part of Homebrew's gnumeric package), Python and XlsxWriter, PowerShell, etc. There are many ways to write Excel files, a quick Google should throw up something that fits the tools you have available.