The issue with I13834 is not singular, it is everything.
The sample is radio-carbon dated and if you knew anything about radio-carbon dating you would understand that it's not a simple procedure that can just "go wrong". The end result is produced after many tests. Not only is the result correct, but the same result was obtained for other samples:
• I13836/1237; Tumulus 2, grave 8, 7 (petrous bone), genetically female, adult.
Her age is estimated to be over 40 years old. The skeleton only preserves the skull. The skeleton derives from Tumulus 2, grave 8. The grave was oriented north-south. The skeleton was well-preserved, in a supine extended position, with the right hand on the abdomen and the left by the side. No grave goods were found in the grave. Radiocarbon date obtained from this individual is: 1452-1619 calCE (385±15 BP, PSUAMS-8300).
• I13834/1235; Tumulus 2 , grave 1? (petrous bone), genetically male, adult.
His age is estimated to be over 40 years old. The skeleton is well presented.
The skeleton most likely derives from Tumulus 2, grave 1. The grave was oriented NE-SW, with the inhumation in a supine extended position. The radiocarbon date obtained from this individual was 1402-1439 calCE (515±20 BP, PSUAMS-5942).
So what you're saying is that radio-carbon dating produced the same wrong result for two different samples in a series of many tests. It's laughable. Do yourself a favor and try to read how such matters work.
Tumuli in Albania were re-used during the middle ages and there's nothing "weird" about finding a medieval profile which is close to IA profiles from the same region. It just means that a part of the Albanian population didn't have much admixture with other groups even in the middle ages. We've got plenty of modern samples which have very small amounts of other admixtures and this explains why this sample is actually close to modern Albanians, but has even less admixture from other sources:
Distance to: ALB_MA:I13834
0.02996863 Greek_Thessaly
0.03053380 Italian_Tuscany
0.03247228 Italian_Emilia
0.03272630 Italian_Piedmont
0.03307333 Albanian
0.03360127 Italian_Lombardy
0.03569227 Swiss_Italian
0.03570263 Italian_Umbria
0.03579009 Greek_Macedonia
0.03590673 Greek_Argolis
There's no problem, it's just that you don't like the results . It's utterly irrelevant if the Slavs of Boboshtica have menus in Cyrillic. Have as many Cyrillic menus as you want, it won't change the fact that in the same region the local profile was retained throughout the ages up to the modern day for at least a part of the population.
PS 1
Your idea that internet fora members, Lazaridis, the Reich Lab and the Albanian government are all conspiring to make IA samples look modern is beyond laughable...but seriously you're not doing yourself a favor by posting crazy conspiracy theories just because you don't like the fact that they show that Albanians lived in the early medieval Korca plain and the Slavs of Boboshtica just came in the middle ages and were later slowly pushed out by the local Albanians and other Albanians who came from other areas. Just deal with it.
PS 2
This is not going to be forgotten:
PS 3
Add to the list of groups who are "conspiring" FTDNA. They uploaded the sample exactly for what it is: a medieval man from the early 15th century. Cheers.
https://discover.familytreedna.com/y-dna/R-PF7563/tree