It is.
> Xiaomi for example
Xiaomi was blacklisted [1]. Their CFO was arrested in Canada for fucking this up [EDIT: Nope!]. Xiaomi turned off their devices in Iran last year [2] in a bid to lift the restrictions.
> Samsung
There was a brief respite in sanctions during the nuclear deal. The pages you’re citing are from that era. Samsung withdrew from Iran [3]. Iran, for good measure, responded by banning them [4].
[1] https://www.cfo.com/accounting-tax/2021/01/xiaomi-and-cnoonc...
[2] https://www.globaltimes.cn/page/202109/1234058.shtml
[3] https://asia.nikkei.com/Spotlight/Iran-tensions/Iran-sanctio...
[4] https://asiatimes.com/2021/11/iran-bans-goods-from-south-kor...
If I recall correctly, CFO of Huawei was arrested in Canada, not Xiaomi.
This is also beyond the general thing which is that you often have national-level subsidiaries that are only "sales partners" or the like.
I do think there's also some differences depending on the kind of goods sold. Binance existing and theoretically helping with circumvention of sanctions probably make it a beautiful target.