Now in the US, building codes are allowing construction of buildings of 6 stories with only the first being concrete and iron, and the upper 5 wood frame with n

Now in the US, building codes are allowing construction of buildings of 6 stories with only the first being concrete and iron, and the upper 5 wood frame with neither concrete nor iron structure, and such buildings are proliferating. Is this CLT a part of the rationale that such structures are acceptably durable?