The 35d throttle valve you and I bought is manufactured by Pierburg. Pierburg is the OEM for the 35d throttle valve. Therefore, the part you and I bought is an OEM part.

A part that has the roundel ground off, covered up, removed, obliterated in any way is not OE. It is not original. It is not literally the same as BMW. It is in fact literally and most assuredly NOT BMW.

It may very well function and perform like an OE part. It may look and feel like an OE part. The OEM might have excess inventory and this is how they sell them. They may not have wanted to change the cast mold but still wanted to be able to manufacture and sell these parts to the consumer. These parts may not meet or even been tested per BMW requirements. There are legitimate reasons why the OE markings are obliterated.

If you want to distinguish between OEM parts without any indications of ever being marked as OE and OEM parts like you and I bought, OE-like is a descriptor you can use. Or, if you're not into the whole brevity thing, you can say it's an OE part with the roundel obliterated. If you want to be precise, you can call it OEM.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim