The EXTENDED_ARG is included in the multibyte ops, I treat it just like any other operator. Here's a snippet of my hacked-dis.dis output, which made it clear to me that I could just count them as an "operator with word operand."
0001dc83 7c 00 00 LOAD_FAST x
0001dc86 91 01 00 EXTENDED_ARG 1
0001dc89 70 9f dc JUMP_IF_TRUE_OR_POP L1dc9f
0001dc8c 7c 00 00 LOAD_FAST x
0001dc8f 0c UNARY_NOT
0001dc90 91 01 00 EXTENDED_ARG 1
0001dc93 6f 9f dc JUMP_IF_FALSE_OR_POPL1dc9f
0001dc96 7c 00 00 LOAD_FAST x
0001dc99 74 01 00 LOAD_GLOBAL None
0001dc9c 6b 08 00 COMPARE_OP 'is'
L1dc9f:
0001dc9f 91 01 00 EXTENDED_ARG 1
0001dca2 72 ab dc POP_JUMP_IF_FALSE L1dcab
0001dca5 7c 00 00 LOAD_FAST x
0001dca8 6e 03 00 JUMP_FORWARD L1dcae (+3)
L1dcab:
0001dcab 7c 00 00 LOAD_FAST x
L1dcae:
0001dcae 7d 00 00 STORE_FAST x