I understand B.S. is in the middle of updating video content, and that is the reason why the lecture slides do not match the content. However, while new video content is a significant amount of work to complete, rearranging lecture slides to match new videos so that paid users of B.S. resources can use their time efficiently is comparatively trivial. When you make a change in video content, then issue a change in lecture slides concurrently. That way, as you continue renovations to the resource, the slides and videos remain coordinated.
New information will be a constant feature in this kind of resource, so there is in theory no end to the number of renovations you will have to complete to remain current with the practice of architecture. Therefore, you need a policy of remaining coordinated at all times and only releasing video changes when you are ready to release a coordinating study guide change at the same time.
You are a business - listen to your customers. We have been raising this issue for years now - look at some of the older posts about this problem.