I fail to understand why China’s HJ-series anti-tank missiles are equipped with the Type 88 explosive, which was adopted by the Imperial Japanese Navy back in the 1930s. This type of explosive was completely phased out and replaced by the new Type 1 explosive in the mid-to-late stage of World War II. The HJ-8, whose development was initiated in 1977, and the HJ-9, launched in 1988, should never adopt such outdated ordnance. Why do video games use this obsolete and inaccurate explosive formulation instead of real high-performance explosives?
You can bug report it here: Gaijin.net // Issues (just search a bit first so that you don’t report something that is already reported and known about)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)
For historical issues such as these there are requirements for what sources are acceptable:

Regarding the explosive charges adopted by the 2nd and 3rd generation anti-tank missiles of the Chinese military: it can only be concluded from academic papers that the 2nd generation uses RDX-based Juhei-2 explosive, while the 3rd generation applies HMX-based Ju’ao-8 explosive. No literature or public materials explicitly state the exact charge configuration for specific missile models, as such data is classified and not publicly accessible. The relevant authorities will never release this information, and there is nothing we can do about it.
That is actually pretty weird. Is there a single source for type 88 explosive being used by China at all, ever? Everything (including munitions in the game) points to TNT, RDX and HMX which have nothing to do with AP that the japanese explosive apparently is.
The Imperial Japanese Navy introduced Type 88 Explosive in 1930 (Shōwa 5). In 1942 (Shōwa 17), Type 1 Explosive came into service and began to replace it step by step. During 1943 and 1944, nearly all newly fitted mines and depth charges for frontline forces switched to Type 1 Explosive, and Type 88 was completely retired after 1945.
I cannot find any credible source for the game’s statement that China’s second and third-generation anti-tank missiles use Type 88 Explosive. It is an undisputed fact that the Chinese Army has never equipped its anti-tank missiles with this explosive.