Minimum standard. The emphasis here is on impermanence, which is the most significant knowledge underlying stream-entry (SN 25 1-10).
"If, monk, anyone teaches a doctrine of disenchantment with decay-and-death, of dispassion [leading to] its cessation, that suffices for him to be called a monk who teaches Dhamma.
Note 3. “This gives a clear indication of the minimum standard required for anyone (today, in the West, often a lay person) setting up as a teacher of Buddhism. It denotes a “worldling” (puthujjana, i.e., one who has not “entered the stream”) who has the basic intellectual knowledge mentioned here.”—-SN 12.16, Walshe
This is a step up from what was said above:
“One who has conviction & belief that these phenomena are this way is called a faith-follower: one who has entered the orderliness of rightness, entered the plane of people of integrity, transcended the plane of the run-of-the-mill. He is incapable of doing any deed by which he might be reborn in hell, in the animal womb, or in the realm of hungry shades. He is incapable of passing away until he has realized the fruit of stream-entry.”—SN 25.1