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Hi Graham, Thanks for your question.
I can confirm that these are definitely genuine products, but you might not be aware that HP bought the Samsung printer division back in 2017-2018 and are in a process of rebranding all the products to HP over the last few years. They are now starting to discontinue everything Samsung (including all printers and cartridges) and replacing them with HP equivalent printers. Eventually, you'll no longer be able to get the cartridges I'm afraid but for now, the OEM products are all branded HP.
If you need any more help at all, please let me know.