A bunch of stealth radars. JY-27 were one of the newest radar for PLA
On the third comment, which I found it very fascinating, this guy wrote:
"The reasons why the surveillance network, primarily composed of Chinese-made equipment, failed to function can be summarized in the following three points: 1) Overwhelming by Next-Generation Electronic Warfare: The latest Next-Generation Jammer (NGJ-MB) aboard the U.S. Navy's EA-18G Growler completely overwhelmed Chinese anti-stealth radars like the JY-27 and JYL-1. Radar screens were filled with noise, preventing detection of approaching U.S. stealth aircraft like the F-35 and F-22. 2) Radar as a Double-Edged Sword: The moment Venezuelan forces increased radar output to search for targets, they became targets themselves for U.S. anti-radar missiles (AGM-88E) that detected the signal, instantly blinding their "eyes." No matter how powerful the fists—Russian-made air defense missiles—they had prepared, the Made-in-China "eyes" were blind. 3) Terrain-assisted infiltration: U.S. cruise missiles and special forces helicopters flew low, hugging the mountainous terrain, slipping beneath the radar's detection range."
you make the judgement whether he is correct or not.