Simply, because sex and gender seems to be used as synonym, like in many other countries, means gender can be interpreted as biological gender, like previously shared

gender noun [C, U] (SEX) https://perma.cc/8H58-TSU8

B2
the state of being male or female
пол (мужской или женский)

——————

sex noun (MALE OR FEMALE) https://perma.cc/5EZN-SWLY

B1
the fact of being male or female
пол

——————

пол2 N m BIOL https://perma.cc/CLB2-PNS7
пол
sex
пол
gender
мужско́го/же́нского по́ла
male/female
си́льный/сла́бый пол
the stronger/weaker sex
пол

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