There is no evidence to say that there is more reward in marrying a widow than a virgin.If that is the case, why then we earn extra reward for marrying widowed and divorcee? The problem with literalists is you take hadiths in isolation. We have both recommendations, so we have to apply logic to it.
Islam is recognizing virgins have more market pool when it comes to getting married than widowed and divorcees; therefore, it is providing an extra reward and encouragement for Muslims to marry widowed and divorced women. At the same time, Islam doesn't want to create injustice towards virgins, so hence the recommendation to marry virgins as well. That is fair and balanced.
Lastly, instead of running with 1 hadith, approach the topic wholly. This is why early Muslims recommended us that when it comes to fiqh (Islamic jurisprudence), we follow one of the 4 madhabs. This whole new exercise that every Tom and Jerry is gonna run with 1 hadith without taking the whole context into the equation is dangerous, and it does disservice to Islam.
That lecture is not evidence of that, mufti menk 1. isnt a scholar and 2. Doesnt provide evidence that there is more reward than marrying a virgin.