The method MaxPLABSizeBounds() in runtime/commandLineFlagConstraintsGC.cpp uses PLAB::min_size() in the error string instead of PLAB::max_size().

E.g.

 118 static Flag::Error MaxPLABSizeBounds(const char* name, size_t value, bool verbose) {
 119 #if INCLUDE_ALL_GCS
 120 if ((UseConcMarkSweepGC || UseG1GC) && (value > PLAB::max_size())) {
 121 CommandLineError::print(verbose,
 122 "%s (" SIZE_FORMAT ") must be "
 123 "less than or equal to ergonomic PLAB maximum size (" SIZE_FORMAT ")\n",
 124 name, value, PLAB::min_size());
 125 return Flag::VIOLATES_CONSTRAINT;
 126 }
 127 #endif // INCLUDE_ALL_GCS
 128 return Flag::SUCCESS;
 129 }

See line 124