The diodes with the dot are Samsung LM561B+ chips. One generation removed from the C chips. Not "fakes" or "counterfeits". Genuine Samsung chips, introduced in April 2016. About 5% less efficient at test currents, almost no difference at typical operating currents. Otherwise same specs, binning and production quality.
It's another RIU tempest in a teapot IMO, and @legalcanada seems determined to stir it at OG. It is a concern, but much is being made of very little, mainly to throw shade on various players and ethnic groups, and sow a lot of FUD to benefit the chief advertiser on that website. I've used older Samsung chips, 561Bs, for 2 years with great success, they inspired me to develop SolStrips in the first place.
The B+ diodes are popping up because Samsung has cranked back production of the C chips in 3500K as it shifted into production of its newest LM301 chip. I was told that inventories of C chips have already stabilized and shouldn't be a problem going forward.
I have a few of the X2 strips using B+ chips in the 3500K CCT (noted in the listing description). They perform exactly like the C chip strips in every way. You can't distinguish them when lit side by side with the C chips.
More 3500K X2 strips with LM561C chips are already on their way and should be in stock by the end of the month. All of the 2700K and 5000K strips, X1 and X2 versions, are using C chips. The stock issues have only effected the 3500K chips. Going forward, we are committed to using only the latest generation LEDs available in our strips. But rest assured, if you've got a dot on your chip, you've got an excellent, genuine Samsung top-quality LED that will perform at the very highest levels for a long time.