Yeah...when the historical facts are uncomfortably one is open for every crooked explanation!
Sorry to burst your wishful bubble, just look at the map by Ptolemy again.
He knows exactly to differ between the Germanics and the Slavs...there is a clear drawn border right on the map to the eastern Sarmatians!
There wouldn't be any if they would be all the same to him.
Not to mention that he was an Egyptian not a Roman, or that you think the Romans quite stupid not knowing about the many people in an outside of their empire.
Maybe they didn't know so much about the Slavs but they for sure did know their Germans, being at war and trading with them for centuries already...
And if Ptolemy is not enough for you, Pliny the Elder and also Tacitus know to differ between Germanics and Slavs already.
Some sciencetists think that Suebi-Svevi are just Slavs , look on the name.
I hope you don't use the same "scientific" resources as Crow because mainstream history is clear about the Suebi as a germanic tribe:
The Suebi or Suevi (from Proto-Germanic *swēbaz based on the Proto-Germanic root *swē- meaning "one's own" people, from an Indo-European root *swe-, the third person reflexive pronoun) were a group of Germanic peoples who were first mentioned by Julius Caesar in connection with Ariovistus' campaign...
What next? Ariovistus a Slav too???
Ariovistus was a leader of the Suebi and other allied Germanic peoples in the second quarter of the 1st century BC. He and his followers took part in a war in Gaul, assisting the Arverni and Sequani to defeat their rivals the Aedui, after which they settled in large numbers in conquered Gallic territory in the Alsace region.
The Suebians left their traces even today: /wiki/Swabia
2000 years ago, the Suebi or Suevi were an Elbe Germanic tribe whose origin was near the Baltic Sea, which was thus known to the Romans as the Mare Suebicum (today, the term "Swabian Sea" is applied to Lake Constance). They migrated to the southwest, becoming part of the Alamannic confederacy.
Swabia (sometimes Suabia or Svebia) (German: Schwaben, also Schwabenland or Ländle) is a cultural, historic and linguistic region in Germany.
What is it with you guys...is your own history not enough for you now you need to steal from others???