Diaereses don’t indicate stress. They indicate separately pronounced vowels.
When you say OP, who are you talking about? The author of the post was talking about hyphens, and nothing about stresssed syllables, and I’m the one who brought up diaereses, and I wasn’t referring to stressed syllables, either.
You are right in that specific case, but I was thinking of another case of pronunciation: where to put the stress.
Co-operative —> co ó perative Re-elect ----> re e léct.
But maybe OP wasn’t referring to that.
Diaereses don’t indicate stress. They indicate separately pronounced vowels.
When you say OP, who are you talking about? The author of the post was talking about hyphens, and nothing about stresssed syllables, and I’m the one who brought up diaereses, and I wasn’t referring to stressed syllables, either.