The reasons for the latest delay aren't clear (or confirmed by Nvidia, for that matter). But according to WCCFTech's report, ...

The vanilla RTX 5060 is seemingly also delayed until May.

A strengthening Euro has allowed Nvidia to reduce prices on its RTX 50-series GPUs by approximately 5% in European markets.

The RX 9070 was designed as more of an RTX 5070 competitor, but it can actually compete and even sometimes beat the more-expensive RTX 5070 Ti.

Put it all together (along with those performance bumps thanks to reducing texture sizes by 10% and RTX Remix Runtime giving ...