It could be. That's a common problem. When I first got Vixen back in 2019, she took longer than I liked for her oil light to go out from startup. I verified it with a manual gauge and then yanked the engine out. There was about 1/2" or so of sludge in the bottom of the pan. I cleaned it up, cleaned up the pickup, replaced the rod and main bearings even though they were good. I just happened to have some. I also put a new timing set back in it and put it all back together. I still have that original engine against the wall in the shop. It had great oil pressure when I put it back together. It was getting pressure before, but it was restricted just enough that it delayed the oil light going out. I still think before you do anything, you should verify the oil pressure loss on a manual gauge. Then you won't just be guessing. I just hate guessing. lol
