Nah, there's any number of in-universe explanations. CRTs in our world were still being sold new as of a decade or so ago. Why shouldn't Deckard have an old one still kicking around in 2019?

Or, if you think they would have been phased out earlier given that Blade Runner world tech developed differently than ours, then: Deckard is just attached to old things. (Remember he's also got a real acoustic piano in his high-rise apartment.)

Or, the entire photo enhancing contraption is produced by some legacy police equipment supplier that's still writing their software in Java 1.3 and using CRTs because...internal corporate reasons.

Or (least plausibly but most just-suspend-your-disbelief) that's not really a CRT, it's a far more advanced brand-new tech that just so happens to also have a curved screen and fuzzy pixels because <insert technobabble>.