Can you explain and cite a few credible sources that explain how beer by itself causes a tummy.
How does beer cause a lean person (10%~13% bodyfat) to have a tummy?

Even if its converted to fat, that fat will be burned off in a caloric deficit just like fat in your body storage or other food.

If I maintain a 500cal deficit, and drink 1 can beer daily, I will still end up with 6 pack abs in ~3 months.

You will only bounce back if you go into caloric surplus.

U will keep losing weigh if you stay in caloric deficit regardless if you drink alcohol.
You cannot defy physics.

If your body TDEE drops by 300~500cal once your lose weight, you will have to recalculate your new TDEE and get back into caloric deficit.
TDEE ussualy reduce cause your body is lighter, moving around use less cals.
Not always because "metabolism slows cause starving"
Calorie deficit always works. Its physics.

Biggest losers gain back weight cause they go into big surplus due to eat alot food after the show.
That's why you shud be in 300~500 deficit not crash diet 1500 deficit.

It's ussualy wise to eat at TDEE after a deficit for few months to give yourself a break before resuming deficit later on.

Stop reading any news website to get your info. They ussualy suck and full of misinformation.
Follow sources like Mike Israetel from Renaissance Periodization

No you only can gain weigh in surplus no matter what.
Of course TDEE gonna drop alot if you lose 100kgs. Adjust your diet intake accordingly.
My TDEE at 85kg was 3100 cals, now at 81kg is 2800cals.
Peak BULLSHIT