Sorry I can’t be sure… but it sounds like what it says…that they’re waiting to complete review of all the remaining applicants to make a final comparison. It might be similar to “waitlist” but not in the traditional sense until May 1 when UBC can see how many more students can be admitted based on # of enrollment but rather until a final comparison can be made (I assume by April 10th). So I don’t think you should worry too much!