That makes a lot of sense to me. A puthujjana needs to be very careful not to slander the Buddha, the Dhamma, the Sangha, or the Vinaya. They also need to maintain humility, avoiding innovations that only an ariya could rightly recognize as true. Instead of saying, ‘I know things are this way,’ they might say, ‘I understand it this way,’ or ‘In such-and-such discourse, the Buddha taught this.’ By taking this kind of care, they avoid going astray—and avoid leading others astray as well.