Congrats on the launch but I'm skeptical of the claims. Slack is distracting because talking to people is distracting, but also necessary. This just seems to rearrange where that happens.
Fundamentally, other people and their communication should be ignored and regimented to specific parts of your day or week (depending on your role). You can do this with slack, email, phones, this tool. Simply turn off the notifications. Within the office you can only do this by having a door that can be locked, which is generally not available.