I know the difference between if-if vs if-elif statements, but do both belong to the definition of a chained conditional, or is the definition of chained conditionals only with if-elif statements correct?
Yes, you are right. This is a chained conditional statement.
if 1 > 2:
print("1 > 2")
elif 2 == 1:
print ("2 == 1")
else:
print("2 > 1")
And this is a sequence of conditional statements that are not chained together.
if 2 > 1:
print("2 > 1")
if 3 > 2:
print("3 > 2")