A watt is a watt pushed no matter what.
Yes. I'd agree but a watt isn't a mile.
If it's acceptable to you to ride some 'miles' on an exercise bike and load them onto Strava as a manual entry then carry on. What anyone else thinks is completely irrelevant.
I absolutely agree with this.
The thread title though asked if exercise bike miles count towards yearly totals. While I don't mind how individuals treat this I just feel road riding is miles the rest is exercise and strength building.
I'm not someone who gives kudos for every ride posted. I only do it for those where I know the effort which must have taken place. Where I know a comparison. On Zwift etc. I have no idea what is an achievement, I've no comparison so I never give kudos on indoor miles.
The one exception is when I know someone is working to come back from injury or accident. That is very much intended as encouragement.