Those, who have purchased the specified vehicles prior to the stated time, will still have them in garage.
The reason for the removal is the introduction of the French Tech Tree. Originally, PzKpfw 38H735 (F) and PzKpfw B2 740(F) were French and they were placed on the German Tech Tree as captured materiel.
Thus, if you want to buy PzKpfw 38H735 (F) or PzKpfw B2 740(F), you still have time to do it prior to 06:00 CET (5:00am GMT), 13 February. Further, it will be possible to acquire the above mentioned vehicles within special actions, which will be announced in advance.