non-standard CHECKMULTISIG usage

[amaclin1]

Have a look 
https://mempool.space/tx/5482617024fb1aedcd29828547d5e169d5be28261468a6df9066cfdd5886e780
(I am not a sender/receiver of it)

[Clearnet]

Would you please elaborate on what it means?

[achow101]

For those wondering, the inputs have a witness stack of

Code:

00
3044022055fd9cf5b3fecff35bf3a4fcc517fa7e781d5411b5624a8c6ee12a47f34d90dd02203b829b7b700a2a59349b9d137a25e46be5df3104e2f14748f0c18f64b3f9092701
304502210095813f6a74f44a5fafac59b4d1616e79e64c1b18286357588b37c082b385b30602200a99e7d47286442e10ed83610020fcc3ee787f449d2fe4a82acfeaea9cb05efe01
02
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6
522103416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a62103157e46f7e48d3aa5440a478ddb2c040dcaa5ecf061e820cccbf8763eabb697632102eb3b6b93f6dfdebea68febac071422a94a0fddf3727ebc50fe29906c14c25cb65fae 

The witness script decodes to

Code:

OP_2 03416299921f66491349cf663df1da76e8aa7866f00c31578182a5ab7ca15a67a6 03157e46f7e48d3aa5440a478ddb2c040dcaa5ecf061e820cccbf8763eabb69763 02eb3b6b93f6dfdebea68febac071422a94a0fddf3727ebc50fe29906c14c25cb6 OP_15 OP_CHECKMULTISIG

This is an interesting anyone can spend construction. Presumably it must have been done on purpose as it would be rather difficult to guess the correct witness script. But why?