Yes playing through pain in important matches, not through friendlies that don't matter.
Indeed.
I think for joe public, the best analogy would be: if you have an important exam at school or an important event at work, you'd attend, even if you had the flu or severe cold. You'd take medication to push past the pain barrier.
If however, it's a regular day at school or work, you stay at home, and rest.
I also checked the line-ups and I think that the only player from Spurs who started was Dier.
Perhaps this is a case of Jose, discussing with his players that when they play friendlies, they need to inform Southgate that they are not feeling 100% and do not want to risk aggravating an existing injury.
In the case of Jones, this would not be a lie. He was clearly injured and not able to play without injections.