Just realize Star San should be diluted!
Doh! Don't you read labels, instructions...
Dilution: 6 ml per US gallon, or 1.56 ml per liter.
I poured a little into the flash and swirled it around then let it drip out. hope that doesnt affect anything!
Well, looking at the low amount of beer you've got in the flask, it may very well affect the yeast. Starsan is 50% Phosphoric Acid, that pH may be very low.
If 1.5 ml of the syrupy concentrate clinged to the inside of the flask, you made a double strength Starsan working solution (0.5 liter) from which you made a starter. pH will be well under 3.0
Speaking of the amount of wort/beer in the flask:
Boiled 500ml of water with 50g of DME.
DME : water at 1 : 10 (by weight), that's the correct ratio, yes.
But please, check your starter volume in the flask. It looks kinda low.
It's hard to tell from the photo's vantage point, but if I had to guess you only have around 300ml in that flask. Add some clean water to it to bring it to 500ml.
IIRC, there's a probably a line on the flask at 800 ml, so the 500ml level should be about half way up to that, considering the taper.
But 500 ml is quite a bit short, you'd need at least 1 liter starter for this beer. Especially knowing your yeast is over 7 months old (Dec 17, 2021), viability being low, 20-30% at best.
I'd prepare another 500 ml of starter wort and add it to the flask. It will also dilute that Starsan to half its strength.
Are you using a stir plate? Or manual swirling?
If the latter, it should be swirled well, and often, once an hour at the least. More often is better.