I saw this topic came up again recently. I recall a long thread last year that I thought put this to bed. But I guess not. The electronic oil pump speculation appears to be based on a video by the Car Care Nut saying the oil pump was electronic and calibrated for 0w-16. This being the reason for strict adherence to the 0w- 16 oil (not here to debates that specifically.)
Searched YouTube to try to find this video and figure out where this came from, but instead found this.
A video of the Car Care Nut assembling the A25A in question and talking about the oil pump chain (9:59.) I think people might just be confusing something he said at some point or he misspoke. Moreover here is link to the engine breakdown (see: lubrication system diagram) explaining that it is driven by a short chain and operates with pressure control valves via ECM. https://toyota-club.net/files/faq/18-03-20_faq_df_r4_eng.htm#A25A-FKS
So there you have it. Not electronic but yes pressure is electronically controlled.
Searched YouTube to try to find this video and figure out where this came from, but instead found this.
A video of the Car Care Nut assembling the A25A in question and talking about the oil pump chain (9:59.) I think people might just be confusing something he said at some point or he misspoke. Moreover here is link to the engine breakdown (see: lubrication system diagram) explaining that it is driven by a short chain and operates with pressure control valves via ECM. https://toyota-club.net/files/faq/18-03-20_faq_df_r4_eng.htm#A25A-FKS
So there you have it. Not electronic but yes pressure is electronically controlled.