Wow, an article from 1998. And do you suppose that work on mammalian phylogenetic trees has ceased over the past ten years? No, genomic data means that we have just gotten started.
72,743 articles on phylogeny. Many thousands from the past ten years. Obviously you know less than you claim about the science of phylogeny and its current state of being if your authoritative source is ten years old and doesn’t claim what you are trying to say it claims.
Woohoo, argument by info-dump. Sorry, that doesn't back up your claim.