One example given is "aag" in Urdu and Hindi, which is present in Sanskrit (agan?). However, there are similar words present in aryaa'ii guroh kii zabaaneN. Examples: ogone (ruusii), ugnis (luthvaanii), and ignis (laatiinii), etc.
I don’t quite follow the line of thought in this example. The etymon of Hindi/Urdu “aag”, via Prakrit, is Sanskrit “agni” (“agan” is an ardha-tatsama form found in Rajasthani, and sometimes used in Hindi/Urdu and other languages as well). This cannot have anything to do with local unrelated languages like Mundari. The other Indo-European words listed are cognates of Sanskrit “agni”.
P.S. I think in Urdu the correct spelling is “aaryaa’ii” and not “aryaa’ii”.
The author seems to be suggesting that the influence (baa for two) might be from the Mundari language. Qureshpor and Au101 were discussing Latin above. The Mundari language might have been affected by Latin, etc. in some manner...?! Or there might have been a dv to b change as mentioned by Au101 above for the potential Sanskrit root...?! Who knows...?!
I don’t see how Mundari could be affected by Latin. And as for numbers such as “baarah” and “baanve”, they have clear Indo-Aryan etymologies, with Sanskrit “dv” sometimes becoming “b” (alternatively, dv > v > b, or dv > db > b) in Prakrit/MIA as shown by Turner:
6658 dvāˊdaśa ʻ twelve ʼ RV. 2. duvāˊdaśa RV.
1.
Pa. dvādasa, bārasa, Aś.shah. badaya (Hultsch badaśa), gir. dbādasa, NiDoc. dvadaśa, badaśa, Pk. bārasa, bāraha, Ash. bäis, bās, Wg. bāš, Niṅg. bas, Dm. báš, Tir. bọ̈̄, Niṅg. bas, Shum. bās, Woṭ. bārō̃, Gaw. bāš, Bshk. bāh, Sv. bā̆š, Phal. bāš, bōš, Sh. bāĭ (→ Ḍ. baī), K. bāh, S. ḇārãhã (ḇāraho m. ʻ the figure 12 ʼ < Pk. bārasaya -- n.), L. bār(h)ã, khet. bārhā̆, P. bārã̄, bhaṭ. bārā, WPah. bhad. bāhrē, bhal. bāre, pāḍ bārah, paṅ. cur. bāhrā, Ku. N. A. B. Or. bāra, Mth. bārah, Bhoj. bārē, Aw.lakh. bārā, H. bārah, bārā, OMarw. bārā, G. bār, M. Ko. bārā, Md. bāra.
2. Aś.man. duvaḍaśa, kāl. duvāḍasa, jau. duvadasa, dh. duvādasa, Pk. duvālasa, Kt. dyīċ, Pr. wṳ̄zu, üz, Paš. duwāˊi, Tor. duāš, Kand. dwālaš, Mai. dwālaš, ky. duwāˊleš, Si. doḷasa, doḷaha, Md. doḷos.