Training two times a day for first olympic

That plan sounds exactly like what my brother did for his Full Ironman Training in 2002.  He hit the pool every morning when it opened at 5:00AM then rotated run and bike days.  I personally do the opposite.  I swap bike/run days in the morning when I did my first Triathlon in 2015 and swam over my lunch break 4 days a week.

No swimming more will not hurt you bike or run. unless you have to cut out bike and run work outs to get your 5 swims in.

There's more to being tired than just muscular fatigue in your legs. If you are swim training the way you should be, it is definitely fatiguing. Unless swimming is a SEVERE weakness for you, I would not follow that plan. It is true that swimming more will make you a faster swimmer, but you are racing a triathlon and you need to figure out the schedule that will get you the fastest overall time. Biking and running improvements (or deficiencies) will effect your time more than swimming.

For me, I swim 3 a week in the "off season", 2 times a week during the season. I'm an "adult onset" swimmer. Since I do not have that childhood swim background to fall back on and I am not swimming a lot, I need to make sure that my swim practices are very effective. I always go to masters, with coaches that know me, my goals and my schedule. Every practice has a purpose, and has a stroke development focus, but I also a fitness focus. So I'm always thinking about some aspect of improving my stroke, and I'm also always swimming HARD, at least for the appropriate part of the workout.

That leaves me the time I need to really work on bike and run fitness.  In a week with 13 hours of training, only 2:10 to 2:30 of that will be swimming during the season.