Many meetings include a statement of “silence is agreement.” It’s a nice, clean statement that can grease the rails of that particular meeting to get to the end. However, saying it and having it be true are two very different realities.
There are many reasons that people would not speak up on a call. Assigning words and decisions to them without their explicit agreement can be a significant mistake. If you need their approval and buy-in, you should always get it directly. Give them an opportunity in a forum they are comfortable in to speak up and have a conversation around what you need from them.
Silence may be an agreement but assuming that it is could turn it to disagreement. The better interpretation should be “silence means we are ok to keep moving.” It is fair to expect people to at least mention the existence of a showstopper even if they aren’t going to express the details yet. Offline conversations are part of the process.