He reviews an article published about the offensive. According to the authors of the article (link in video):
The Ukrainians did attempt a massive push but it was stopped by the Russians at the start of the offensive. The offensive was hampered by Ukraine's inability to coordinate above the Battalion level resulting in poorly coordinated assaults that resulted in heavy causalities of personnel and equipment. The offensive has now ground down to a battle of attrition being fought at platoon and company level maneuvers. Here the Ukrainians have an advantage but are often fighting "Z storm" units comprised of convicts (the Russians themselves view these units as "expendable infantry units"). The final conclusion was that a newest, shiniest weapon system (currently F16s) is unlikely to change much on the front line. The war will be won by who is better supplied by the "non glamourous" systems like artillery shells, ammunition, night vision optics, etc. Russia has been ramping up production of these types of items. What remains to be seen is how long Western countries will continue to support Ukraine.