Brookfield's business is extremely complex. Naturally, investors tend to reject things they find complex. Sometimes, it goes as far as to state there is some sort of scandal going on.
Brookfield Infrastructure was even the subject of a short report in which the shorter tried to make the business even more complex in an attempt to highlight the fact there was accounting schemes going on. It didn't really last all that long.
I cannot comment on the article as it is paywalled. But this wouldn't be the first time their accounting setup has been brought into question. It has largely been a nothing burger for many years.