Yes, this is exactly what happens in barrels, but sadly we can not talk about an increasing in wine aromas in a simply way. First, even if everything else is concentrating, aromas are going to get partially lost for some reasons. One reason is wood absorption, so aromas are bond to the wood matrix, being the thiols the more susceptible of this phenomenon. Another reason is slight oxidation, where therpenes are also involved pretty well. Second, we should discuss about aroma's coverage, since wood will release its own flavors, covering the original wine aromas. Even polysaccharides coming out from wood can bind aromas, reducing their volatility and perception. Again, MLF can change drastically aromas in wine pattern, and it usually happens during barrel ageing. So if you talk about a overall concentration in aromas (sum of volatile compounds whatever the origin) the answer is yes, but if you talk about a "original wine aromas concentration", the answer, to me, it is not.