This list of military strenght is nothing more than a propaganda paper created by german nationilist/right winged parties during the elections of the Reichstag with the intention to threaten the voters because of a possible german defenselessness ensuring voters will elect those parties and support their demands of a rearmed german military in the Republic of Weimar and a "possible" revision of the treaty of Versailles.
And Freikorps, in terms of armed paramilitary forces, did not exist anymore after the year 1920 in the Republic of Weimar. To hide a secret rearmement, in terms of training troops, which was against the treaties of Versailles/Trianon and St. Germain there were various strategies for the first german Democracy.
Three examples:
1. Conscription time was reduced so more soldiers could be trained but the troops limitation of 100.000 of the Reichswehr was not exeeded, because trained soldiers joined civil-life again.
2. German factories still produced submarines, but now for foreign clients until 1935. (Knowledge and Know-how was still there and was even improved.)
3. Military education and training of pilots was forbidden. So across the country gliding schools and clubs were established where new pilots were schooled and educated. Many pilots of the first days of the Luftwaffe gained experience with flying airplanes for civil airlines such as the german "Lufthansa" or airlines from other countries.
Well:
1) Versailles did leave Germany with a very small army relative to her population, so the fact that this was in retrospect considered unjust in part explains the unwillingness to prevent Germany rearmament
2) Germany inherited from the Prussian tradition the concept of the Army and pride in Service as a core part of the National identity. Hence disarmament was a particularly punitive thing to do to her. The second time around the Allies did a much, much better job of demilitarising German culture.
3) Czechoslovakia, being new had no real territorial claims. On the other hand Germany was bordered by France - which had the greatest military reputation in the world at the time; and Poland, possessed of probably the second best military reputation in Europe. Neither of these powers is especially friendly to Germany and in addition the Poles remembered not only being oppressed by the Germans but also the great extent that the Poland once had.
As such Polish attempts to expand her borders could not be ruled out, and it should be remembered that the French had invaded Germany as recently as 1923
4) For all the above reasons, over-turning Versailles and expanding the armed forces was hardly a fringe belief in Weimar Germany - it may well be one of the most popular things Hitler did. Though he was building on the groundwork laid in the 20s