Well, it looks like OPPO could indeed be skipping a number as the OPPO Reno10, OPPO Reno10 Pro and OPPO Reno10 Pro+ have appeared in the SIRIM Database. Previously, the OPPO Reno8 series launched in Malaysia back in July 2022 with the OPPO Reno8 and Reno8 Pro from RM2399. 

OPPO has launched the Reno10 series in China, which includes the Reno10, Reno10 Pro and Reno10 Pro+. The Reno10 starts at 2499 yuan (~RM1634), the Reno10 Pro starts at 2899 yuan (~RM1895), while the Reno10 Pro+ starts at 4,299 yuan (~RM2,811). They will be available from 1 June 2023, but only for China, so there's no Malaysia release dates or pricing details.

OPPO has officially confirmed that the Reno 10 series will be launching on 24 May 2023 with a teaser image that shows the back of the phones in the series. According to this, there will be 3 versions which includes the OPPO Reno10, OPPO Reno10 Pro and OPPO Reno10 Pro+ but the launch date will likely just be for China.