These abstract script descriptions are produced by Bitcoin's CScript.ToString(). It's a Bitcoin bug if they are incorrect.
It looks like OP_0 was intended to push a numerical 0. It's probably a bug if it doesn't push anything. (The script in this case is broken either way, though.)
The
descriptions of the opcodes also describe this as a push-zero (alias OP_FALSE) rather than push-nothing (there are already 11 NOP opcodes, why do we need another?)
This script appears to me to be potentially solvable if OP_0 is a NOP, unsolvable otherwise. However it does feel to me like interpreting it as push-zero makes a lot more sense.
I do recognize that this opcode is unlikely to have been used anywhere, but any use of it (or any successful claim of these coins) would make it impossible to make some kind of change here without causing a netsplit.
I recognize that I've probably gone badly off-topic with respect to this topic title now...