A 200 ft is not even a reportable deviation
The 200 ft would not set off an RA, but the rate of climb within this 200ft would well trigger an RA (rate of closure calculation, giving a predicted resolve-resolution).
If SV was exceeding say 1500ft a minute rate of climb towards other traffic, for a few seconds from his flight level and in this time gain 200 ft, he would trigger an RA due to the rate of closure. (it's not the 200 ft giving the RA but the rate of closure). They stopped what ever triggered it within 200ft from the flight level!
I am sure the FDR will be unloaded and the truth be told!