Again, you aren't reading the license. You DO HAVE PERMISSION if the copyright management company or owner allows you to use them for your video and you don't monetize it. That clause in your licensing agreement that says "The claimant is allowing their content to be used in your YouTube video. However, ads might appear on it." is your permission/license to do so. We can argue this all day long. I have been through this many times in the past 10 years of working with music and copyrights for projects that I have done for Non Profits and we have had council with copyright lawyers who will back my claims here.
NOW if you are doing videos professionally, or you are trying to monetize your videos in anyway regardless of whether you are posting on YouTube or you are selling them in some other way for profit, you better buy a license to use them.