Paris-Saclay is a semi finished university. It is just a cluster of Grandes Ecoles (Polytechnique, ENS Cachan and HEC) with local university. The French government tends to merge various small niche organisations into a new entity, pooled its facilities and declare it an excellent university without accounting for funding and structure. Each department head still protects his fiefdom (research institute).
To reach international excellence, the new organisation needs top academics (in my subject current impact factor of some profs is still mid tier even at Grandes Ecoles), funding (state and particularly endowment lags behind Harvard), strong students from outside France to diversify its student body (most institutions still rely on domestic grad students from a small pool). Paris-Saclay needs to reach out, structures need to be reorganised for a transformational change. There are a few good post grad courses and I would seriously consider them. Compared to British or Dutch unis, French unis don't reach out to international applicants much. Incidentally, tuition fee at Grandes Ecoles makes studies expensive.
The Chinese are already well represented in QS world ranking and have improved their unis. Add to Singapore, Hong Kong and Taiwan's top unis. Some of them are higher ranked than most French unis.