Newsnow is not a 'source', it is a news aggregator website and links to many different websites independent from it.
Can you link to the article you are talking about, as I can't see any mention of £100m here...?
https://www.newsnow.co.uk/h/Sport/Football/Premier+League/Burnley
Are they? Any links? If you mean Glenn Hoddle saying Spurs or Everton should buy him, that is not evidence they want him. It is a suggestion by Hoddle not a rumour.
Yes, Barcelona in 2020 use tactics. A huge amount of work goes into preparing for each game, far more than the Saints team of 60 years ago you mentioned.
Brazil 50 years ago also used tactics, but significantly less detailed.
It has nothing to do with the manager becoming more the focus of the media. Tactics have become significantly more detailed in the last 60 years. They can't be left for the players to implement on the pitch as a collective without outside input.
Or more that it doesn't lose its best players in their prime. Ronaldo is not in his prime, he is in decline.
As for Neymar, you need to reassess why he left.
Pray for what purpose? Why would god give a shit about my ramblings on an internet forum, when he doesn't give a shit about children he designed to die of cancer or in a global genocidal flood?