I speak Irish pretty well and Duolingo I think is a fantastic tool to get better and learn some new words that I didn't no. (Neither my dad nor I knew portán meant crab). The issue is that pronunciation in Irish is kinda varied but the lady who does it for Duolingo is on some extreme. The majority of Irish speakers would not pronounce things that way in the slightest and it would be misleading for someone who learned on the app to actually try and speak it as I'm not sure I would understand them