How can they be safe and unsafe at the same time?
Borates are considered safe because it’s extremely unlikely that people would ever be exposed to the levels necessary to reach toxicity. Like many trace elements, borates are both essential at low concentrations and toxic at high concentrations. While hazard is associated with high doses of borates over a long period of time, there are biological reasons that make it almost impossible for people to be exposed to high enough concentrations of borates in their daily lives to harm their health.
