Yes, the downvote button has been removed. We've received a number of complaints about it in the past, it doesn't actually impact Karma, nor how posts are surfaced to anyone so this felt like a pretty safe feature to disable for now.
These reactions are utilized to assist you when you just need to provide a simple emoji versus a full response. In most cases we've found many of you do both which largely defeats their purpose. There is still some value in keeping the others as many of you clearly make use of it.
Let us know how well the Confused works for you.