No, because Lightning is not an open standard. OOXML has been an open standard for nearly two decades.

And a big issue for me is this blog post hurts LibreOffice because the largest reason enterprises won't touch it is that it is perceived as incompatible even when that compatibility works just fine.

If success and good marketing was the focus, LibreOffice would happily promote that it will take any file format they get because they have robust interoperable software that doesn't actually mind handling XLSX!