Actually, there is more CPU mining then asics on testnet4, they just fake the block time to get the lowest difficulty. Look at this (mostly difficulty 1 blocks):
Block 46521: Timestamp: Sun Sep 22 01:26:32 UTC 2024 | Difficulty 1
Block 46520: Timestamp: Sun Sep 22 01:06:31 UTC 2024 | Difficulty 1
Block 46519: Timestamp: Sun Sep 22 00:46:30 UTC 2024 | Difficulty 1
Block 46518: Timestamp: Sun Sep 22 00:26:29 UTC 2024 | Difficulty 1
Block 46517: Timestamp: Sun Sep 22 00:06:28 UTC 2024 | Difficulty 1
Block 46516: Timestamp: Sat Sep 21 23:46:27 UTC 2024 | Difficulty 150569646.7815716
Block 46515: Timestamp: Sun Sep 22 01:26:34 UTC 2024 | Difficulty 1
Block 46514: Timestamp: Sun Sep 22 01:06:33 UTC 2024 | Difficulty 1
Block 46513: Timestamp: Sun Sep 22 00:46:32 UTC 2024 | Difficulty 1
Block 46512: Timestamp: Sun Sep 22 00:26:30 UTC 2024 | Difficulty 1
Block 46511: Timestamp: Sun Sep 22 00:06:28 UTC 2024 | Difficulty 1
Block 46510: Timestamp: Sat Sep 21 23:46:26 UTC 2024 | Difficulty 1
Block 46509: Timestamp: Sat Sep 21 23:26:25 UTC 2024 | Difficulty 1
Block 46508: Timestamp: Sat Sep 21 23:06:24 UTC 2024 | Difficulty 1
Block 46507: Timestamp: Sat Sep 21 22:46:23 UTC 2024 | Difficulty 1
Block 46506: Timestamp: Sat Sep 21 22:26:21 UTC 2024 | Difficulty 1
Block 46505: Timestamp: Sat Sep 21 22:06:18 UTC 2024 | Difficulty 150569646.7815716
Block 46504: Timestamp: Sat Sep 21 23:46:21 UTC 2024 | Difficulty 1
Block 46503: Timestamp: Sat Sep 21 23:26:20 UTC 2024 | Difficulty 1
Block 46502: Timestamp: Sat Sep 21 23:06:15 UTC 2024 | Difficulty 1
Block 46501: Timestamp: Sat Sep 21 22:46:13 UTC 2024 | Difficulty 1
Block 46500: Timestamp: Sat Sep 21 22:26:11 UTC 2024 | Difficulty 1
Block 46499: Timestamp: Sat Sep 21 22:06:10 UTC 2024 | Difficulty 1
Block 46498: Timestamp: Sat Sep 21 21:46:09 UTC 2024 | Difficulty 1
Block 46497: Timestamp: Sat Sep 21 21:26:08 UTC 2024 | Difficulty 1
Block 46496: Timestamp: Sat Sep 21 21:06:06 UTC 2024 | Difficulty 150569646.7815716
