default or selected kernelversion does not have config value CONFIG_PSTORE_DEFLATE_COMPRESS.
Result is shown for kernelversion 6.9.9

DEFLATE (ZLIB) compression

configname: CONFIG_PSTORE_DEFLATE_COMPRESS

Linux Kernel Configuration
└─>File systems
└─>Miscellaneous filesystems
└─>DEFLATE (ZLIB) compression
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This option enables DEFLATE (also known as ZLIB) compression
algorithm support.